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| All Patents in class 285/334 | |||||
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| Number | Date | Patentee | Title | Type | |
| 658,087 | Sep. 18, 1900 | C.A. Higbee | Pipe coupling | ||
| 2,079,692 | May 11, 1937 | F.J. Lapointe | Broach shank connector | broaches | |