Technician doing maintenance work on a #1 crossbar switch, 1938.

Technician doing maintenance work on a #1 crossbar switch, East 30th St., New York, New York, 1938. Each large link frame contains 20 crossbar switching units. These units contain electromechanical relays and involve no large mechanical movements, as in the panel switch. Indeed, the only mechanical movements are the opening and closing of the relays. (Courtesy of AT&T Archives and History Center.)

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