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| All Patents in class 74/402 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,282,018 | Oct. 22, 1918 | F.O. Albertson | Valve Grinder | valve grinding tools | |
| 1,291,728 | Jan. 21, 1919 | C.H. Beach | Agitator | food and drink mixers | |