CPC Subgroup
F01C 21/089 Full Title
Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00 > Rotary pistons (reciprocating pistons in general F16J)
F01C 21/089 Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00 > Rotary pistons (reciprocating pistons in general F16J)