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| Patents for F. A. Otto | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 642,155 | Jan. 30, 1900 | E. Campbell, G. Redford | Wrench | |
 | 656,260 | Aug. 21, 1900 | T.A. Panyard | Caliper Attachment | |
 | 693,353 | Feb. 11, 1902 | J.B. Erwin | Can Holder | |
 | 742,238 | Oct. 27, 1903 | A. Roesch | Jar Holder | |
 | 760,532 | May 24, 1904 | A.J. Gerhardt | Wrench For Meat Choppers | |
 | 1,132,663 | Mar. 23, 1915 | C.J. Luther | Honing Implement for Chisels, &c. | |
 | 1,196,789 | Sep. 05, 1916 | W.F. Koelpin | Calipering Tool | |
 | 1,450,598 | Apr. 03, 1923 | E.J. Kearney | Slide Actuating Mechanism | |