File:Blower worm gear.png
![File:Blower worm gear.png](http://upload.wikimedia.org/wikipedia/en/thumb/c/c8/Blower_worm_gear.png/408px-Blower_worm_gear.png?20210317062427)
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![]() | 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
[edit]1907 US patent image of multi-start worm gear as used in hand-cranked blower. Patent US869247 by Henry Keiper.
File history
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current | 06:24, 17 March 2021 | ![]() | 2,320 × 3,408 (87 KB) | Drf5n (talk | contribs) | 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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