mechanical handlers, mechanical conveyors for transporting and/or supporting of work pieces between and/or during working operations; suction grippers and mechanical grippers for work pieces and parts thereof, namely, supporting arms, swivel arms, cantilever beams and supporting frameworks; machine parts, namely, mechanical couplings for connecting supporting arms and cantilever beams and for connecting supporting frameworks for grippers with a robot arm or other transport drive; machine parts, namely, supporting frameworks for grippers with roboter arms and transport drives; machine parts, namely, clamping pieces and clamping blocks for interconnecting the parts of gripper frameworks; nozzles and nozzle carriers for creating a vacuum for suction grippers [ ; machine parts, namely, work piece bearing blocks and work piece bearing rollers of plastic ]