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 169
atus connected to any of the makes of central office equipmentdescribed in this volume. First Class—Subscribers Station using a Single Telephone or a Tele-phone with Extension.—The photographs, of both a wall and a desk tele- 151 152 A UTOMA TIC TELEPIION Y phone are shown in Chapter 3, and with… … Red Thread
Telephone
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