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| All Patents in class 464/99 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,947,052 | Feb. 13, 1934 | A.S. Lack | Power Transmission Coupling | power transmissions | |
| 2,341,981 | Feb. 15, 1944 | H. Davids | Shaft Coupling Mechanism for Internal Combustion Engines | opposed piston engines | |