Kidder, Frank E. (Frank Eugene), 1859-1905, Nolan, Thomas, 1857-1926 · New York : W.T. Comstock · leaf 369
Fig. 388. … Fig. 389. the keyhole or to use any picking instrument to operate the tumblersvertically, the shape of the keyhole shown on the face, Fig. 388,being continuous throughout the length of the lock. An incidental advantage resulting from this change in the keyholeis that as it differs absolutely from…
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