CA 244/7
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CA 244/7 is a Canadian patent category for heavier-than-air craft sustained in the air by airplane wings and auto-rotating (helicopter) "wings" (propellers).[1][2][3]
The first one of these that comes up in CIPO was issued in 1930.
References
This wiki has 0 patents in category "CA 244/7". Other techtypes related to CA 244/7: USPC 244/8
Enclosing categories | CA 244/3 |
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Subcategories | |
Keywords | Airplane, Airfoil, Propulsion, USPC 244/8 |
Start year | |
End year |