ELECTRO-MECHANICAL TELEPHONE EXCHANGE. Bags instead of Barrels for Sugar. California Gold. Preparation of Wool. particles of grease have been removed from it. Pig. I.–TELEPHONE WITH KEYS ATTACHED. Fig. 3TELEPHONE CENTRAL OFFICE. Fir. 2THE SWITCHING MACHINE, scientific american, 1892-11-26
ELECTRO-MECHANICAL TELEPHONE EXCHANGE. Bags instead of Barrels for Sugar. California Gold. Preparation of Wool. particles of grease have been removed from it. Pig. I.–TELEPHONE WITH KEYS ATTACHED. Fig. 3TELEPHONE CENTRAL OFFICE. Fir. 2THE SWITCHING MACHINE, scientific american, 1892-11-26
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