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| All Patents in class 222/273 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,364,869 | Jan. 11, 1921 | E.R. Draver | Liquid-feed regulator | ||
| 1,369,968 | Mar. 01, 1921 | E.R. Draver | Feed-regulator | ||
| 1,400,668 | Dec. 20, 1921 | E.R. Draver | Feeding device | ||