Automatic telephony; a comprehensive treatise on automatic and semi-automatic systems (1921)
Smith, Arthur Bessey, b. 1875, Campbell, Wilson Lee · New York : McGraw-Hill · leaf 116
RCORIi00> 2M.F. Fig. S4.—Circuit of 2-digit group connector. Two-Digit Group Connector.—The circuit of a two-digit group con-nector is shown in Fig. 84. There are two private wipers, and the privatebank has a pair of contacts for each point (like line bank). P-\ is theupper wiper and P-2 the…
Telephone
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