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| All Patents in class 48/212 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 331,080 | Nov. 24, 1885 | L.H. Nash | Method of Operating Gas Engines | |
 | 1,698,526 | Jan. 08, 1929 | A.J. Bassett | Method of Manfacturing Oil Gas | |