CPC Main Group
F01B 21/00 Combinations of two or more machines or engines (F01B23/00 takes precedence)
2 direct subcodes
Child Classifications
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- F01B 21/02 the machines or engines being all of reciprocating-piston type
- F01B 21/04 the machines or engines being not all of reciprocating-piston type, e.g. of reciprocating steam engine with steam turbine