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| All Patents in class 241/3 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,223,260 | Nov. 26, 1940 | D.A. Meeker | Coffee mill | coffee mills | |
| 2,618,244 | Nov. 18, 1952 | E.G. Roehm | Pilot Valve Controlled Tracer Valve | hydraulic apparatus | |