File:US1682572-3.jpg
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Summary
| Description | Patent for C. W. KEUFFEL OPTICAL INSTRUMENT (a direct reading spectrophotometer). |
| Date | |
| Source | https://patents.google.com/patent/US1682572 |
| Author | C. W. Keuffel |
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Licensing
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This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929.
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File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 11:40, 11 February 2024 | | 531 × 781 (76 KB) | RaboKarbakian | {{Information |Description=Patent for C. W. KEUFFEL OPTICAL INSTRUMENT (a direct reading spectrophotometer). |Source=https://patents.google.com/patent/US1682572 |Date=1925-10-15 |Author=C. W. Keuffel |Permission= |other_versions= }} {{PDF}} Category:United States patent 1682572 Category:Carl W. Keuffel Category:Spectrophotometers |
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