IPIQ

MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING

F01

MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES

F01C

ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES

1/00

Rotary-piston machines or engines

F01C1/24

of counter-engagement type, i.e. the movement of co-operating members at the points of engagement being in opposite directions