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| All Patents in class 235/94R | |||||
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| Number | Date | Patentee | Title | Type | |
| 300,734 | Jun. 17, 1884 | G.H. Preston | Device for changing speed | industrial machine mechanisms | |
| 1,896,527 | Feb. 07, 1933 | C.R. Houghton | Tandem meter | gas meters | |