US Patent 436,411 · 16 Sep 1890

Drill-proof plate behind the lock

by George J. H. Goehler, Buffalo, New York

Patent drawing of a safe door edge with dial knob, layered plate and combination wheels
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George J. H. Goehler's safe door, US patent 436,411 of 1890, sheet 1. Public domain, via Google Patents.

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