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 265
Fig. 204.—Line finder frame. Fig. 205.—Rotary switch for sender selector. one trunk line or subscriber line (tip, ring, and sleeve). One hundredsets of strips (300 strips) are built up into one bank. The arrangement issuch that the lugs may be aligned vertically in rows, and groups of rows.At the…
Telephone
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