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Key-shaped locking plate

Patent drawing of a diamond-shaped mail bag frame with hinged metal side plates, an arched carrying handle, and detail views of locking plates, crank-levers, and pin fasteners used to seal the bag.

MAIL-BAG.Charles P. Tatro · November 18, 1890

United States patent drawings and specifications are works of the U.S. government and are in the public domain — they were never copyrighted. Download them, print them, frame them. Our commentary and descriptions are © 2026 The Duck & Game Call Patent Archive.

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