Category:1920s patents
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Subcategories
This category has the following 7 subcategories, out of 7 total.
- 1922 patents (1 F)
- 1923 patents (1 F)
- 1924 US patents (empty)
- 1925 patents (5 F)
- 1929 patents (1 F)
Media in category "1920s patents"
This category contains only the following file.
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US1448235 Portable Baby Cage Fig 1.png 1,197 × 1,577; 130 KB