US Patent 1,887,866 · 1932 (filed 1926)

Double door floor safe

by Samuel L. Belknap

Patent drawing in section of a tapered steel floor safe set in concrete, with its flanged base locked into the concrete and two lockable doors one above the other at floor level
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Samuel L. Belknap's double door floor safe, US patent 1,887,866 (filed 1926, granted 1932): the tapered body and wide base flange are cast into the concrete floor. Public domain, via Google Patents.

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