having piston-rod of one piston passed through other piston

Machines or engines with two or more pistons reciprocating within same cylinder or within essentially coaxial cylinders > with oppositely reciprocating pistons > acting on same main shaft > using only connecting-rods for conversion of reciprocatory into rotary motion or > having piston-rod of one piston passed through other piston

Machines or engines with two or more pistons reciprocating within same cylinder or within essentially coaxial cylinders (in opposite arrangement relative to main shaft F01B1/08) > with oppositely reciprocating pistons > acting on same main shaft > using only connecting-rods for conversion of reciprocatory into rotary motion or vice versa > having piston-rod of one piston passed through other piston