F01C 1/39

Rotary-piston machines or engines having the characteristics covered by two or more groups [CPC: F01C1/02], [CPC: F01C1/08], [CPC: F01C1/22], [CPC: F01C1/24] or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group [CPC: F01C1/02] and having a hinged member with vanes hinged to the inner as well as to the outer member