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| All Patents in class 165/54 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,748,126 | Feb. 25, 1930 | E.A. Hall | Pilot Stem | valve grinding tools | |
| 2,110,367 | Mar. 08, 1938 | I.J. Knudson | Air Conditioning System | air conditioning apparatus | |