with helical teeth

Full Title

Rotary-piston machines or pumps > of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing > of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member > with helical teeth

Classification Context

Section:

MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING

Class:

POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS

Subclass:

ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS