POWER-OPERATED TOOLS FOR PRESS BRAKES AND FOR INDUSTRIAL USE, NAMELY, METAL PRESSES, METAL CLAMPS FOR HOLDING PIECE PARTS ON MACHINE TOOL TABLES; PARTS OF POWER-OPERATED PRESS BAKES, NAMELY, CLAMPING SYSTEMS COMPOSED PRIMARILY OF MACHINE SPECIFIC UPPER ADAPTATIONS, PACKING ELEMENTS, ADJUSTING ELEMENTS, ADAPTORS, UPPER ADAPTATIONS, LOWER ADAPTATIONS FOR PRESS BRAKES WITH CLAMPING SLOT, MACHINE SPECIFIC LOWER ADAPTATIONS, UNIVERSAL KEYS, HYDRAULIC CLAMPING UNITS, AND MECHANICAL CLAMPING UNITS