Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 172
\Desk atand-i. … FIG. m.-BRIDCING DESK SET CIRCUIT-COIL IN BELL BOX. generator can never cause its own bell to ring, a feature desired bymany users. ^ The apparatus by which the automatic switching between thesignalling and the talking apparatus is accomplished—the switch-hook—while very simple, merits attention in…
Telephone
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