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American telephone practice (1905)

Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 147

An illustration from American telephone practice, 1905, leaf 147
ows the spring of the yoke to force the armaturefurther from the pole-pieces, thus securing a coarser adjustment. Fig. 99 shows two views of the working parts of the Stromberg-Carlson ringer. This is similar to that of the Holtzer-CabotCompany, save for the method of adjustment. In this, the…

Telephone

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