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 271
Fig. 213.—Commutator. … Fig. 214.—Sequence switches mounted. THE SYSTEM OF THE WESTERN ELECTRIC COMPANY 249 A single sequence switch is shown in Fig. 215. It consists of a hori-zontal shaft with many insulating discs on it. Each disc is termed a
Telephone
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