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* TENSILE * SHEAR AND COMPRESSION STRENGTH MATERIAL TESTERS; BONDING AND WELDING EQUIPMENT, NAMELY, WELD TRANSFORMERS, WELD HEADS, ELECTRODES, FOOT SWITCHES, BATTERY POWERED WELDING UNITS, SOLDERING POWER SUPPLY UNITS, CONSTANT VOLTAGE DC POWER SUPPLY UNITS FOR PARALLEL GAP BONDING AND MICRO-ELECTRONIC WIRE BOND PULL TESTERS