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| All Patents in class 235/61B | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,404,450 | Jan. 24, 1922 | G.A. Lofland | Direct Reading Proportional Scale | scales | |
| 2,416,772 | Mar. 04, 1947 | F.A. Reece | Pilotage Rotameter | measurement gauges | |