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APPARATUS AND DEVICES FOR THE MANUFACTURE, CONTROL CONDUCTION AND UTILIZATION OF COMPRESSED FLUIDS, AND PARTS THEREFOR, PLATE VALVES FOR COMPRESSORS AND ALL KINDS OF AUTOMATIC PISTON TOOL MACHINES, REGULATION DEVICES FOR COMPRESSORS, WORKING CYLINDERS FOR COMPRESSED FLUIDS, THE CONTROL MECHANISM REQUIRED FOR THE CONTROL FOR OPERATION BY HAND, FOOT, CAM OR ELECTROMAGNETIC, AUXILIARY COMPRESSED AIR DEVICES-NAMELY, FILTERS, OILERS, REDUCING VALVES, THROTTLE VALVES, RETURN VALVES AND PARTS THEREFOR; CLUTCHES AND PARTS THEREFOR, CLUTCH PLATES AND TRACTION VEHICLES FOR ENGINE SERVICES