CPC Subgroup
F02B 37/22 by varying cross-section of exhaust passages or air passages (F02B37/24 takes precedence)
Full Title
Engines characterised by provision of pumps driven at least for part of the time by exhaust > Control of the pumps > by varying cross-section of exhaust passages or air passages (F02B37/24 takes precedence)
1 direct subcode
Child Classifications
Navigate with arrow keys, Enter to open