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Dust-proof closure

Patent drawing of a mail bag frame showing hinged rubber-covered metal side plates forming a square opening, with detail insets of the spring-loaded hook lock, thumb-piece, and padlock staple mechanism.

MAIL-BAG.Joseph Hanauer · September 15, 1891

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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