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| All Patents in class 55/DIG.031 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,390,297 | Dec. 04, 1945 | H.L. Gilmore | Gas purification | ||
| 2,620,066 | Dec. 02, 1952 | H.L. Gilmore | Air cleaner | dust collectors | |