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 295
ch locks and causes the transmission of theimpulses, exactly as was described for the regular connection, the onlydifference being that the impulses, instead of going out over the wipersTF-80 and TF-81, pass over the wires 346 and 347, to the special firstselector. Trunking from Automanual to… … Fig. 234.—500-line installation.
Telephone
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