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| All Patents in class 418/152 | |||||
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| Number | Date | Patentee | Title | Type | |
| 959,049 | May 24, 1910 | F.P. Boland | Positive-pressure blower | blowers | |
| 5,174,742 | Dec. 29, 1992 | G.A. Putney | Rotary Air Motor with Curved Tangential Vanes | ||