Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics (1892)
Benjamin, Park, 1849-1922 · New York, D. Appleton · leaf 505
\ ale duplex lock 482 LOCKS. drawal of the key, will assume their normal positions with respect to each other. The minorkey will be suppHed to the tenants of an apartment-building, for example, aiid, while it will
Mechanical engineering
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