US Patent 17,150 · 1857

Clockwork guard for a lock

by Amos Holbrook and Henry D. Fish

Patent drawing of a lock with two round clock dials on the left and a bolt mechanism on the right, labelled Holbrook and Fish, Time Lock, No. 17,150, patented Apr. 28, 1857
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Amos Holbrook and Henry D. Fish, US patent 17,150 (1857): two clockwork movements guarding one lock. US patent drawing, public domain.

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