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| All Patents in class 417/371 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,321,126 | Jun. 08, 1943 | G.W. Breuer | Dust-tight blower | blowers | |
| 3,088,042 | Apr. 30, 1963 | R.I. Robinson | Electric motor with improved cooling means | motor cooling | |