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| All Patents in class 192/56.56 | |||||
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| Number | Date | Patentee | Title | Type | |
| 950,635 | Mar. 01, 1910 | H.L. Johnston | Driving mechanism | coffee mills | |
| 1,406,491 | Feb. 14, 1922 | T.F. Rataiczak | Automatic release | ||