Difference between revisions of "Patent of Mary Hallock-Greenewalts colour organ (Q31164)"
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(Created claim: Backup document (P74): US1731772.pdf) | (Created claim: Copy available online (P37): https://patents.google.com/patent/US1731772A/en) | ||
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Revision as of 20:47, 29 April 2023
No description defined
| Language | Label | Description | Also known as |
|---|---|---|---|
| English | Patent of Mary Hallock-Greenewalts colour organ | No description defined |
