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| All Patents in class 122/4A | |||||
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| Picture | Number | Date | Patentee | Title | |
| 595,497 | Dec. 14, 1897 | W. Rowbotham | Oil, Gas or Like Engine | ||
| 1,214,754 | Feb. 06, 1917 | D.F. Carscadden | Counterboring Tool and Holder | ||