US Patent 186,369 · Jan 1877

Twin-movement time lock

by James Sargent

Patent drawing of a safe door with two clock movements mounted above a combination lock, labelled J. Sargent, Time Attachments for Locks, No. 186,369, patented Jan. 16, 1877
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James Sargent's US patent 186,369, applied for in June 1873 and granted in January 1877: a twin-movement time attachment guarding a combination lock. US patent drawing, public domain.

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