USPC 244/65
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Screw propeller propulsion
Subcategories:
- U.S. patent classification subclass 244/66 is for patents related to tilting propellers:
| Enclosing categories | USPC 244/62 |
|---|---|
| Subcategories | USPC 244/66, USPC 244/67, USPC 244/68, USPC 244/69 |
| Keywords | Propellers, Aerial propellers |
| Start year | |
| End year |
