View source for CPC B64C11/005

A subclass of patents on spiral-shaped propellers.  This subclass has no subclasses under it.<ref name=esp>{{espCPCcat|B64C11/005}}</ref><ref name=pto>{{ptoCPCcat|B64C|11/005}}</ref>
Tech class tree:
* [[CPC B64C11/00]]: Propellers, e.g. of ducted type; Features common to propellers and rotors for rotorcraft (rotors specially adapted for rotorcraft B64C27/32)
** . . . 
** [[CPC B64C11/005]]: Spiral-shaped propellers
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{{Techtype
|Enclosing categories=CPC B64C11/00
|Keywords=propellers
}}