US Patent 793,072 · 27 Jun 1905

Rotary-door manganese steel safe

by Henry D. Hibbard, Plainfield, New Jersey, and Wilbur M. Stone, Brooklyn, New York

Patent drawing in section of a round screw door seated in a heavy safe body, with thread segments
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Henry D. Hibbard and Wilbur M. Stone's rotary-door safe, US patent 793,072 of 1905, sheet 1. Public domain, via Google Patents.

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