F01C 1/3448

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: F01C1/08] or [CPC: F01C1/22] and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member {with axially movable vanes}