Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
F02B75/00—Other engines
F02B75/28—Engines with two or more pistons reciprocating within same cylinder or within essentially coaxial cylinders
F02B75/285—Engines with two or more pistons reciprocating within same cylinder or within essentially coaxial cylinders comprising a free auxiliary piston