Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 280
rder-wire circuit, /, terminating inthe telephone set of the operator at section 10. The operator at sec-tion 4 is thus enabled to communicate with the operator at section10 over this circuit, and the former informs the latter of the num-ber desired, and of the particular transfer plug, C, she is…
Telephone
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