Electrical power distribution blocks and units; power transformers for welding apparatus; transformers for heating apparatus for metalworking; transformers; electric connectors; diodes; rectifiers; power supplies; power-supply for welding apparatus; inverters for welding apparatus; voltage regulators and power controllers for use with electric welding apparatus; voltage regulators and power controllers for heating apparatus for metalworking; electric wires and cables; thyristors for welding a...