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| All Patents in class 418/121 | |||||
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| Number | Date | Patentee | Title | Type | |
| 478,843 | Jul. 12, 1892 | A.F. Brown | Rotary Engine | rotary steam engines | |
| 974,913 | Nov. 08, 1910 | J.W. von Pittler | Rotary compressor of the like | air compressors | |