File:Blower worm gear.png

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Public domain
The text and illustrations of US patents are in the public domain in the United States unless the patent text contains a specific notice that portions are copyrighted.[1][2][3]

The original patent contains no such notice, so its contents are in the public domain in the United States.

Summary

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1907 US patent image of multi-start worm gear as used in hand-cranked blower. Patent US869247 by Henry Keiper.


https://patents.google.com/patent/US869247A/en

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