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| All Patents in class 173/156 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,279,532 | Sep. 24, 1918 | G.H. Gilman | Drilling Apparatus | ||
| 3,071,989 | Jan. 08, 1963 | E.A. Timm | Feed mechanism for machine tools | hydraulic apparatus | |