CA 244/20

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CA 244/20 is a Canadian patent category for helicopters with "rotor lift" or direction control.[1][2][3]

References

  1. ↑ Subclasses of patent class CA 244
  2. ↑ Definition of subclass CA 244/20
  3. ↑ List of Canadian patents in subclass CA 244/20 filed before 1925

This wiki has 0 patents in category "CA 244/20".



Enclosing categories CA 244/15
Subcategories
Keywords Helicopter
Start year
End year
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