DIFF Subgroup Additional Only
F02G 2244/54 having two-cylinder twin systems, with compression in one cylinder and expansion in the other cylinder for each of the twin systems, e.g. "Finkelstein" engines
Full Title
Machines having two pistons > Double acting piston machines > having two-cylinder twin systems, with compression in one cylinder and expansion in the other cylinder for each of the twin systems, e.g. "Finkelstein" engines