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All Patents in class 251/282 | |||||
Number | Date | Patentee | Title | Type | |
1,772,406 | Aug. 05, 1930 | L.E. Whiton | Valve | steam valves | |
2,020,773 | Nov. 12, 1935 | H. Ernst | Deflection Variator | metalworking machine mechanisms | |
2,083,774 | Jun. 15, 1937 | J.C. Campbell | Sensitive Valve Mechanism | hydraulic apparatus |