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| All Patents in class 418/15 | |||||
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| Number | Date | Patentee | Title | Type | |
| 924,024 | Jun. 08, 1909 | J.T. Wilkin | Vacuum-pump | vacuum pumps | |
| 958,345 | May 17, 1910 | J.T. Wilkin | Vacuum-pump | vacuum pumps | |
| 5,383,771 | Jan. 24, 1995 | R.D. De Rome, T.J. Diedrich, A.P. Ghode | Air Motor with Offset Front and Rear Exhausts | ||