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| All Patents in class 91/210 | |||||
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| Number | Date | Patentee | Title | Type | |
| 224,093 | Feb. 03, 1880 | J.F. Kingsley | Oscillating Engine | oscillating steam engines | |
| 1,731,482 | Oct. 15, 1929 | L.F. Nenninger, H. Ernst | Spindle Oscillator | grinding machines | |