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| Patents for J. Walter Douglass | |||||
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| Number | Date | Patentee | Title | Type | |
| 271,897 | Feb. 06, 1883 | J.H. Mitchell | Icing-machine for confectionery | baker | |
| 271,898 | Feb. 06, 1883 | J.H. Mitchell | Machinery for ornamenting cakes, &c. | baker | |
| 287,072 | Oct. 23, 1883 | A. Weed | Machine for stripping file-blanks | file cutting machines | |
| 834,622 | Oct. 30, 1906 | T. Keepfer | Adjustable Handhold for Saws | saw handles | |
| 850,184 | Apr. 16, 1907 | C.S. Rees | Cork-puller | lever cork extractors | |