US Patent 136,239 · 25 Feb 1873
Crank-pin safe-door hinge
by Joseph L. Hall, Cincinnati, Ohio
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Same maker or decade
1867 Dovetailed door and casing
1872 Spherical safe with revolving door
1873 Spherical burglar-proof safe
1875 Fire-proof safe filling
1876 Time attachment for locks
1877 Twin-movement time lock
← 1872 Spherical safe with revolving door All patents 1873 Spherical burglar-proof safe →
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