US Patent 8,145 · 10 Jun 1851
Parautoptic bank lock
by Robert Newell
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Around the same time
1834 Fire-proof wrought-iron chest
1843 Combination safety-lock for doors
1857 Clockwork guard for a lock
1865 Pin-tumbler cylinder lock
1867 Spherical burglar-proof safe
1867 Dovetailed door and casing
← 1843 Combination safety-lock for doors All patents 1857 Clockwork guard for a lock →
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