Specifications for the multiplex printing telegraph system : theory and operation (1920)
Western Union Telegraph Company · [New York?] : The Company · leaf 294
Page 11 Section 7 Multiplex System 263-C … Fig. 9 plugs are inserted so that the small index pin on the outside edge of the connector plugsis opposite hole No. 1 on all three plugs, the plug marked R & C in the plug socketmarked Rec. and Corr., the one marked S in the socket marked Send, and the one markedL in the socket marked Local.…
Telegraph
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