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air and water cooled resistance welding cables; air and water cooled electric furnace cables; air and water cooled electric power cables; and connectors, terminals, adaptors and components of such cables; bus bar systems, water-cooled furnace panels, laminated shunts and electrical connectors, adaptors and components of such systems and connectors; delta closures, and anti-chaffing and bumping gear for electric cables; off-load electrical isolators; vacuum contact switches; air and water cooled DC vacuum contact switches; and parts and components of such isolators and switches[ ; and electric cable measuring, analyzing and testing instruments ]