Code 3681 applies to employers engaged in manufacturing or assembling wired electrical equipment or parts for the communication industry such as the telephone, telegraph, radio and television industries.  This classification includes the manufacturing of chassis and cabinets used for these products.  The operations usually involve a considerable amount of bench work and hand assembling.

This classification also applies to manufacturing complete radio and television sets, hearing aids, transformers, coils, sockets, condensers, switches, antennae, phones, speaker units, dials, rheostats, plugs, arrestors, resistors, wire harnesses for radio and television sets, printed circuits, custom coil winding of electronic coils used in aircraft control devices and computers, electrical control relays for aircraft missiles and miniature compensators.