Used Star Lab C1000-Str-230Eu for sale (11,819)

Condition: used, Year of construction: 1989, functionality: fully functional, machine/vehicle number: 119, spindle motor power: 5 W, turning length: 160 mm, spindle speed (max.): 6,000 rpm, spindle speed (min.): 99 rpm, turning diameter: 16 mm, overall weight: 2,300 kg, type of input current: three-phase, bar passage: 16 mm, total width: 1,340 mm, total length: 1,850 mm, total height: 1,685 mm, input voltage: 380 V, number of driven tool stations in tool turret 1: 6, number of driven tool stations in tool turret 2: 6, Equipment: documentation/manual, rotational speed infinitely variable, I am offering my lathe for sale, complete with the accessories shown in the pictures. It includes a bar feeder and a chip conveyor. The machine is controlled by a Yasnac CNC system. The machine has two turrets, allowing for multi-axis and multi-group control. Bdodpfxjy Udcfo Aproc

Condition: good (used), Year of construction: 2004, The machine is powered and available for inspection. Bodpfxjy Eb Rho Aprjdc

Condition: good (used), Year of construction: 2002, The machine is in good condition, equipped with Fanuc Series 16i-T control and FMB Turbo 5-42 bar feeder. Bedpfxoy Eb N De Aprodc

Condition: used, Year of construction: 2025, General information Field of application: Construction Serial number: 63006188 Drivetrain Drive: Wheel Bdedpfxsx Ravge Aprec Weights Empty weight: 72.000 kg Functional Lifting capacity: 300.000 kg Other information Front tyres / undercarriage remaining: 0 Rear tyres remaining : 0 Tyre brand: - Carrier engine: - Upper engine: - Counterweight: 92500 Transport dimensions (LxWxH): 17.09x2.99x3.99 Additional information Please contact PFEIFER GROUP for more information

Condition: used, Year of construction: 2025, Drivetrain Drive: Wheel Weights Empty weight: 60.000 kg Functional Lifting capacity: 250.000 kg Identification Serial number: 52509756 Other information Bdodpfx Aex Sch Ieprjc Front tyres / undercarriage remaining: 0 Rear tyres remaining : 0 Tyre brand: Bridgestone Carrier engine: - Upper engine: - Counterweight: 80000 Transport dimensions (LxWxH): 15.64x2.75x3.99 Additional information Please contact PFEIFER GROUP for more information

Condition: used, Year of construction: 2025, operating hours: 1 h, Drivetrain Drive: Wheel Weights Empty weight: 60.000 kg Functional Lifting capacity: 250.000 kg Identification Serial number: 52509755 Other information Front tyres / undercarriage remaining: 0 Rear tyres remaining : 0 Tyre brand: Bridgestone Bdodpfx Apjxbxpqerjc Carrier engine: - Upper engine: - Counterweight: 80000 Transport dimensions (LxWxH): 15.64x2.75x3.99 Additional information Please contact PFEIFER GROUP for more information

Condition: used, Year of construction: 2025, operating hours: 1 h, Drivetrain Drive: Wheel Weights Empty weight: 60.000 kg Functional Lifting capacity: 150.000 kg Identification Serial number: 51508182 Other information Front tyres / undercarriage remaining: 0 Rear tyres remaining : 0 Bdedpfx Apsxbxpdorjc Tyre brand: Bridgestone Carrier engine: - Upper engine: - Counterweight: 44500 Transport dimensions (LxWxH): 14.64x2.75x3.99 Additional information Please contact PFEIFER GROUP for more information

Condition: used, Year of construction: 2025, Drivetrain Drive: Wheel Weights Empty weight: 60.000 kg Functional Lifting capacity: 150.000 kg Bdsdpsx S Uqusfx Aprjc Identification Serial number: 51508183 Other information Front tyres / undercarriage remaining: 0 Rear tyres remaining : 0 Tyre brand: Bridgestone Carrier engine: - Upper engine: - Counterweight: 44500 Transport dimensions (LxWxH): 14.64x2.75x3.99 Additional information Please contact PFEIFER GROUP for more information

Condition: used, TECHNICAL DETAILS - Number of axes : 7 - Number of spindles : 2 MAIN SPINDLE - Max. bar diameter : 32 [mm] - Travel : 310 [mm] - Spindle speeds : 7.000 [rpm] - Spindle power : 7,5 [kW] - C axis indexing precision : 0,001 [°] COUNTER-SPINDLE - Max. bar diameter : 32 [mm] - Spindle speeds : 7.000 [rpm] - Spindle power : 3,7 [kW] - C axis indexing precision : 0,001 [°] GUIDE BUSH HOLDER 1 - Number of positions : 11 - Number of motorized positions : 5 - Live tools speed : 5.000 [rpm] - Live tools power : 1,2 [kW] END ATTACHMENT - Number of positions : 4 Bdedpjyxr Uqsfx Aproc SECONDARY OPERATION - Number of positions : 4 - Number of motorized positions : 4 POWER SUPPLY - Supply voltage : 200 [V] - Total installed power : 6,2 [kVA] WEIGHT & DIMENSIONS - Machine floor space : 2.711 x 1.275 [mm] - Machine height : 1.705 [mm] MACHINE HOURS - Number of working hours : 18436 [h] - Number of spindle hours : 14949 [h] EQUIPMENT - CNC : Fanuc 32i-B - 3 colors status lamp - Rotating guide bush - Coolant tank - Bar loader : FMB TURBO 3- 36 - Ejection of workpiece - Parts catcher - Parts conveying strip - Fire extinguisher * NB : working order not guaranteed. To have it checked by a qualified organization of the buyer. - Electric transformer

Condition: excellent (used), Year of construction: 2006, TECHNICAL DATA Axis data Rapid traverse rates: X, Y, Z, ZB, XB: 35,000 mm/min C: 198,000 °/min (550 min⁻¹) Maximum feed rates: X, Y, Z, ZB, XB: 10,000 mm/min C: 10,000 °/min (27.8 min⁻¹) Minimum input increment: X, Y, XB: 0.001 mm / 0.0001 inch (diameter) Z, ZB: 0.001 mm / 0.0001 inch C: 0.001° Machining capacities Maximum machining diameter: Ø16 mm (5/8 in) Maximum headstock stroke: fixed guide bushing: 205 mm (8 in) rotating guide bushing: 155 mm (6–3/32 in) rotating magic guide bushing: 155 mm (6–3/32 in) Maximum drilling capacity with driven tool: Ø6 mm (15/64 in), Ø4 mm (5/32 in) Maximum tapping capacity with driven tool: M5×P0.8, M3×P0.5 Maximum milling capacity: Ø10 mm (25/64 in), Ø7 mm (9/32 in) Maximum thread cutting capacity: M8×P1.25 Machine configuration Operating mode: right-hand machining station Design: integrated mechanical/electrical setup Dimensions (L×W×H): 1861 × 1060 × 1750 mm Spindle height: 1060 mm Weight: approx. 1700 kg Main spindle Spindle speed: max. 10,000 min⁻¹ Speed control: S-command + direct 5-digit command Main spindle drive: 2.2 kW (continuous), 3.7 kW (15 min/60% duty cycle) Indexing: 15°, 1° Tool combinations Various combinations with 1–3 spindles for tool diameters Ø12 mm, Ø10 mm, or Ø6 mm Tool holders for ER11 or ER16 Drill mounting Number of tools: 4 Max. speed: 5000 min⁻¹ (ER16), 7500 min⁻¹ (ER11) Drive motor: 0.4 kW Tool selection: servo motor Backworking unit Max. chuck diameter: Ø16 mm (5/8 in) Max. part length: 80 mm Max. outer spindle travel: 30 mm Max. part ejection length: 50 mm Spindle speed: max. 8000 min⁻¹ Spindle drive: 100 W, AC servomotor Tools: 4-spindle unit Max. drilling capacity: Ø8 mm (5/16 in) Max. tapping capacity: M6 × P1.0 Bsdpfx Apewvap Rjrjdc SCOPE OF SUPPLY Includes (non-exhaustive list): STAR SB-16D CNC Swiss-type lathe Fire extinguishing system Coolant tank LNS Tryton-112 bar feeder High-pressure pump Machine accessories Bar feeder accessories Complete operating documentation Exact scope of supply as per photo documentation.

Condition: good (used), TECHNICAL DATA AXLE Rapid feed X,Y: 15000 mm/min Rapid feed A,B: 15000 mm/min Rapid feed Z1,Z2,E: 18000 mm/min Rapid feed C: 90000°/min Smallest input unit: 0.001 mm Smallest input unit, C-axis: 0.001° MACHINING PERFORMANCE Max. turning diameter: 20 mm Max. Headstock stroke: 205 mm Max. Drilling capacity: Stationary: 14 mm; Driven: 8 mm Max. Tapping capacity: Stationary: M10 x P1.5; Driven: M6 X P1.0 MAIN SPINDLE Spindle speed: 500 - 10000 rpm Drive: Spindle drive Main spindle motor: 3.7 / 5.5 kW Main spindle bore: 26 mm WHEELING SPINDLE Max. Clamping diameter: 20 mm Max. Part length for ejection to the front: 150 mm Max. Clamping length: 75 mm Spindle speed: 500 - 10000 rpm Pick-up spindle motor: 2.2 / 3.7 kW Indexing angle: 1°, 15° CONFIGURATION Operation mode: Right-handed Dimensions: 2700 x 1400 x 2400 mm Weight: 3400 kg SCOPE OF OFFER U.A: (list not exhaustive) Control system: Fanuc Fire extinguishing system: Siemens Oil mist separator: Donaldson Transformer Hydraulic unit Parts conveyor Chip conveyor Bar feeder: LNS Tool holder Exact scope of supply according to photo gallery We assume no liability for the correctness, completeness and up-to-dateness of the information. Bjdju Uic Tjpfx Aprsdc

Condition: good (used), STAR SV-32 CNC sliding headstock automatic lathe TECHNICAL DATA Main spindle, bar capacity: 32 mm Travel: 310 mm Spindle speed: 7000 rpm Spindle drive power: 7.5 kW Minimum resolution, C-axis: 0.01 ° Counter spindle, bar capacity: 32 mm Spindle speed: 7000 rpm Spindle drive power: 7.5 kW Resolution, C-axis: 0.01 ° Turret: Number of tools: 10 of which driven: 10 Speed of the driven tools: 5`700 rpm Driven tools, power: 2.8 kW Tool carrier: Bdsdpfx Aeu Uicysproc Number of tools: 4 Of which driven: 3 Speed of the driven tools: 6'000 rpm Weight and dimensions: Weight: 3800 kg Dimensions: 2700 x 1400 x 2400 mm SCOPE OF OFFER U.A: (list not exhaustive) Control system: Fanuc Fire extinguishing system: Siemens Oil mist separator: Donaldson transformer High pressure pump Parts conveyor Chip conveyor Exact scope of supply according to photo gallery We assume no liability for the correctness, completeness and up-to-dateness of the information.

Condition: excellent (used), Year of construction: 2007, STAR ECAS 12 CNC Swiss-type lathe TECHNICAL DATA Maximum machining diameter: 13mm Max. headstock stroke: 205 mm Maximum drilling capability: Stationary tool: 10 mm Power driven tool: 8 mm Maximum tapping capability: Stationary tool: M8 x P 1.25 Power driven tool: M6 X P1.0 Maximum milling capability: 10mm Maximum die cutting capability: M8 x P1.25 Maximum slotting capability: 1.5 x 4 mm Feed rate: Z1, X1, Y1, Z2, X2, Z3, X3, Y3: 18,000 mm/min C1, C2: 194,400°/min Maximum turning feed rate: Z1, X1, Y1, Z2, X2, Z3, X3, Y3: 18,000 mm/min C1, C2: 194,400°/min Bdjdpfx Apjwf Acljrjc Minimum input increment: X1, X2, X3: 0.001 mm Z1, Z2, Z3, Y1, Y3: 0.001 mm C1, C2: 0.001° Spindle speed: 12,000 rpm Indexing angle: 0.01° Dimensions: 2588 x 1150 x 1765 mm Center height: 1040 mm Weight: 3500 kg SCOPE OF OFFER INCLUDES (list not exhaustive): Star Ecas 12 CNC lathe Coolant tank / pump High-pressure system Transformer Operating documentation Exact scope of offer as shown in the photo gallery No liability is assumed for the accuracy, completeness, or timeliness of the information.

Condition: good (used), Year of construction: 1996, functionality: fully functional, STAR SH-12 CNC long lathe TECHNICAL DATA Turning diameter: 13 mm Bjdjvllmhspfx Aprodc Headstock stroke: 140 mm Speed: 400 – 10,000 rpm Spindle power: 1.5 kW Number of tools: 5 Number of tools in the device: 3 Dimensions of the machine: 1500 x 950 x 1650 mm Weight: Approx. 950 kg SCOPE OF OFFER Among other things: (list not exhaustive) STAR SH-12 CNC lathe Bar loader Coolant pump Transformer Exact scope of offer according to photo gallery We accept no liability for the accuracy, completeness and timeliness of the information.

Condition: excellent (used), STAR SR-20R sliding headstock automatic lathe TECHNICAL DATA Spindle diameter: 20 mm turning length: 205 mm Speed range - spindle: 500 - 12,000 rpm Drive power, spindle motor: 2.2 / 3.7 kW Bedpeu Hkh Rjfx Aprsdc Travel X: 265 mm Speed range, counter spindle: 500 - 8000 rpm Drive power, counter spindle motor: 1.5 / 2.2 kW C-axis: 0.001° 19 tool positions: Linear tool holder, front attachment, rear machining SCOPE OF OFFER U.A: (list not exhaustive): STAR SR-20R sliding headstock automatic lathe LNS bar loader transformer Coolant tray Exact scope of supply according to photo gallery We assume no liability for the accuracy, completeness and timeliness of the information

Condition: excellent (used), Star SA-12 Swiss-Type Lathe Technical Specifications Rapid feed (X, Y, Z, ZB): 370 mm Maximum turning feed (X, Y, Z, ZB): 270 mm Smallest input unit (X, Y, Z, ZB): 120 mm Machining Capacity Maximum turning diameter: 13 mm Maximum headstock stroke: 140 mm Maximum drilling capacity: 7 mm Maximum tapping capacity: 7 mm Maximum thread cutting capacity: M6 x P1.0 Main Spindle Spindle speed: 500 – 12,000 rpm Drive: Spindle drive Main spindle motor: 2.2 / 3.7 kW Main spindle indexing angle: 1° or 15° Main spindle bore: 20 mm Tool slide Type: Linear slide Number of tools: 6 tools Number of driven tools: 3 tools (collet: ER 11) Driven tools Spindle speed: 1970 / 2330 rpm Max. drilling capacity: 4 mm Max. milling capacity: 4 mm Pick-up spindle Max. clamping diameter: 13 mm Max. part length for forward ejection: 85 mm Max. unclamping length: 30 mm Spindle speed: 500 – 8000 rpm Pick-up spindle motor: 0.5 kW Tool selection: 4 tools Max. drilling capacity: 4 mm Max. tapping capacity: M3 x P0.5 Bodpfx Apowi Ty Asrsdc Power supply Voltage: 3-phase 200/220 V Frequency: 50/60 Hz Power: Average: 6.0 KVA SCOPE OF OFFER Among other things: (list not exhaustive): STAR SA-12 Swiss-Type Lathe Control: Fanuc Series 18i-T Fire Extinguishing System Coolant Tank Transformer LNS Bar Loader Exact scope of supply as per photo gallery No liability is assumed for the accuracy, completeness, or timeliness of the information.

Year of construction: 2006, condition: excellent (used), STAR ECAS 32 T CNC automatic lathe Bjdpfx Asl R Ix Sjpredc - Very good condition - Many accessories available - Detailed photo gallery included in PDF catalog TECHNICAL DATA Max. Machining Diameter: 32 mm Max. Headstock Stroke: 350 mm Tool Post: First Turret: 10 stations Second Turret: 10 stations Number of turning tools: Max. 2 tools / station Tool shank: 16 mm Sleeve Holder: Number of tools: Max. 3 tools / station Max. Drilling Capacity: 23 mm Max. Tapping Capacity: M12 X P1.75 Max. Die Cutting Capacity: M12 X P1.75 Power Driven Att. Number of Tools: Max. 2 tools / 1 station Max. Drilling Capacity: 10 mm Max. Tapping Capacity: M8 X P1.25 Max. Milling Capacity: 12 mm Max. Slotting Capacity: 2 mm X 10 mm Main Spindle min. indexing degree: 0.01° Main Spindle Speed: 7`000 rpm Power Driven Att. Spindle Speed: 5`700 rpm Coolant Tank Capacity: 230 l Dimensions: 3175 x 1745 x 1860 mm Center Height: 1084 mm Weight: 5`700 kg Power Consumption: 8.0 KVA No responsibility is taken for the accuracy, completeness and timeliness of the information.

Condition: good (used), STAR SV-20 CNC automatic lathe TECHNICAL DATA OF THE CONTROL AXES rapid feed X,Y: 15000 mm/min rapid feed A,B: 15000 mm/min rapid feed Z1,Z2,E: 18000 mm/min Rapid feed C: 90000°/min Smallest input unit: 0.001 mm Smallest input unit, C axis: 0.001°. MACHINING CAPACITY Max. turning diameter: 20 mm Bsdjiq Dp Nspfx Apredc Max. headstock stroke: 205 mm Max. drilling capacity: stationary: 14 mm; driven: 8 mm Max. Tapping capacity: Stationary: M10 X P1.5; Driven: M6 X P1.0 MAIN SPINDLE Spindle speed: 500 - 10000 rpm Drive: spindle drive main spindle motor: 3,7 / 5,5 kW main spindle bore: 26 mm PICK-UP SPINDLE Max. Clamping diameter: 20 mm Max. Part length for ejection to the front: 150 mm Max. Unclamping length: 75 mm spindle speed: 500 - 10000 rpm Pick-up spindle motor: 2,2 / 3,7 kW Indexing angle: 1°, 15 CONFIGURATION Operation mode: right-handed Dimensions: 2670 x 1375 x 1650 mm Weight: 3400 kg We do not guarantee the accuracy, completeness and timeliness of the information.

Condition: excellent (used), Year of construction: 2004, operating hours: 34,500 h, functionality: fully functional, Equipment: documentation/manual, EQUIPMENT: FANUC 18i control Backside machining Synchronized spindle Bjdpfx Apey Hq Tzjrsdc Driven tools C-axis Parts conveyor Bar feeder FMB TURBO 3-26

Condition: used, Year of construction: 1998, functionality: fully functional, Equipment: documentation/manual, CNC sliding headstock automatic lathe Make: STAR Model: SR-20 Year: 1998 Bdedpjy Hg Hdsfx Aproc with: FANUC 16-T control Back side machining Synchronised spindle Driven tools C-axis Bar feeder magazine FMB TURBO 3-26

Condition: used, TECHNICAL DETAILS - Number of axes : 7 - Number of spindles : 2 MAIN SPINDLE - Max. bar diameter : 20 [mm] - Max. machining length : 205 [mm] - Spindle speeds : 10000 [rpm] - Spindle power : 3.7 [kW] - C axis indexing precision : 0.001 [°] COUNTER-SPINDLE - Max. bar diameter : 20 [mm] - Spindle speeds : 8000 [rpm] - Spindle power : 2.2 [kW] - C axis indexing precision : 1 [°] - Number of guide bush holders : 1 GUIDE BUSH HOLDER 1 - Number of positions : 10 - Number of motorized positions : 4 END ATTACHMENT - Number of positions : 7 SECONDARY OPERATION - Number of positions : 4 - Number of motorized positions : 4 - Live tools speed : 8000 [rpm] POWER SUPPLY - Supply voltage : 400 [V] - Total installed power : 7 [kW] WEIGHT & DIMENSIONS - Machine floor space : 2200 x 1200 [mm] - Machine height : 1700 [mm] - Machine weight : 2200 [kg] MACHINE HOURS - Number of hours under power : 34143 [h] - Number of working hours : 26657 [h] - Number of spindle hours : 15552 [h] EQUIPMENT - CNC : Fanuc 30i-model A - HFT (High Frequency Turning) - Rotating guide bush - Parts catcher Bdjdpfsxlum Tjx Aprec - Parts conveying strip - Ejection of workpiece - Coolant tank - Bar loader : FMB turbo 3-26 / 3200 A

Condition: used, TECHNICAL DETAILS - Number of axes : 7 - Number of spindles : 2 MAIN SPINDLE Bedpfxsxlum Hs Aprodc - Max. bar diameter : 20 [mm] - Max. machining length : 205 [mm] - Spindle speeds : 10000 [rpm] - Spindle power : 3.7 [kW] - C axis indexing precision : 0.001 [°] COUNTER-SPINDLE - Max. bar diameter : 20 [mm] - Spindle speeds : 8000 [rpm] - Spindle power : 2.2 [kW] - C axis indexing precision : 1 [°] - Number of guide bush holders : 1 GUIDE BUSH HOLDER 1 - Number of positions : 10 - Number of motorized positions : 4 END ATTACHMENT - Number of positions : 7 SECONDARY OPERATION - Number of positions : 4 - Number of motorized positions : 4 - Live tools speed : 8000 [rpm] POWER SUPPLY - Supply voltage : 400 [V] - Total installed power : 7 [kW] WEIGHT & DIMENSIONS - Machine floor space : 2200 x 1200 [mm] - Machine height : 1700 [mm] - Machine weight : 2200 [kg] MACHINE HOURS - Number of hours under power : 27854 [h] - Number of working hours : 20213 [h] - Number of spindle hours : 13158 [h] EQUIPMENT - CNC : Fanuc 30i-model A - HFT (High Frequency Turning) - Rotating guide bush - Parts catcher - Parts conveying strip - Ejection of workpiece - Coolant tank - Bar loader : FMB turbo 3-26 / 3200 A

Condition: used, TECHNICAL DETAILS - Number of axes : 7 - Number of spindles : 2 MAIN SPINDLE - Max. bar diameter : 20 [mm] - Max. machining length : 205 [mm] - Spindle speeds : 10000 [rpm] - Spindle power : 3.7 [kW] - C axis indexing precision : 0.001 [°] COUNTER-SPINDLE - Max. bar diameter : 20 [mm] - Spindle speeds : 8000 [rpm] - Spindle power : 2.2 [kW] - C axis indexing precision : 1 [°] - Number of guide bush holders : 1 GUIDE BUSH HOLDER 1 - Number of positions : 10 - Number of motorized positions : 4 END ATTACHMENT - Number of positions : 7 SECONDARY OPERATION - Number of positions : 4 - Number of motorized positions : 4 - Live tools speed : 8000 [rpm] POWER SUPPLY - Supply voltage : 400 [V] - Total installed power : 7 [kW] WEIGHT & DIMENSIONS - Machine floor space : 2200 x 1200 [mm] - Machine height : 1700 [mm] - Machine weight : 2200 [kg] Bdjdpfjxpi Igjx Aprjc MACHINE HOURS - Number of hours under power : 46071 [h] - Number of working hours : 33799 [h] - Number of spindle hours : 20194 [h] EQUIPMENT - CNC : Fanuc 30i-model A - HFT (High Frequency Turning) - Rotating guide bush - Parts catcher - Parts conveying strip - Ejection of workpiece - Coolant tank - Bar loader : FMB turbo 3-26 / 3200 A

Condition: used, TECHNICAL DETAILS - Number of axes : 7 - Number of spindles : 2 MAIN SPINDLE Bdjdpfxexlumto Aproc - Max. bar diameter : 20 [mm] - Max. machining length : 205 [mm] - Spindle speeds : 10000 [rpm] - Spindle power : 3.7 [kW] - C axis indexing precision : 0.001 [°] COUNTER-SPINDLE - Max. bar diameter : 20 [mm] - Spindle speeds : 8000 [rpm] - Spindle power : 2.2 [kW] - C axis indexing precision : 1 [°] - Number of guide bush holders : 1 GUIDE BUSH HOLDER 1 - Number of positions : 10 - Number of motorized positions : 4 END ATTACHMENT - Number of positions : 7 SECONDARY OPERATION - Number of positions : 4 - Number of motorized positions : 4 - Live tools speed : 8000 [rpm] POWER SUPPLY - Supply voltage : 400 [V] - Total installed power : 7 [kW] WEIGHT & DIMENSIONS - Machine floor space : 2200 x 1200 [mm] - Machine height : 1700 [mm] - Machine weight : 2200 [kg] MACHINE HOURS - Number of hours under power : 46042 [h] - Number of working hours : 34490 [h] - Number of spindle hours : 19447 [h] EQUIPMENT - CNC : Fanuc 300is-model A - HFT (High Frequency Turning) - Rotating guide bush - Parts catcher - Parts conveying strip - Ejection of workpiece - Coolant tank - Bar loader : FMB turbo 3-26 / 3200 A

Condition: used, Swiss-type cnc lathe STAR SE-12 Bodpfx Apowp T I Tjrsdc