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| All Patents in class 188/251R | |||||
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| Number | Date | Patentee | Title | Type | |
| 316,789 | Apr. 28, 1885 | H.B. Keiper | Device for Converting Motion | metalworking machine mechanisms | |
| 389,723 | Sep. 18, 1888 | R.H. Trumbull | Band-saw wheel | bandsaw wheels | |
| 2,045,452 | Jun. 23, 1936 | G.W. Emrick | Clutch | tapping heads and chucks | |