These were abbreviated designations of the 3-, 4-, or 5-digit USOC that referenced the series of phones. Universal Service Order Codes were the million ways that the Bell System categorized its products and services on a service order.
There was also a 9-digit ComCode number for everything ,and I mean everything, that could be ordered through the supply chain. There was a ComCode for a 4 x 8 sheet of plywood, and a ComCode for a long blue handset cord, and a ComCode for a bottle of aspirin, and a...you get the picture.
Arthur P. Bloom "30 years of faithful service...15 years on hold"
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