F
MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
F04
POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
F04D
NON-POSITIVE-DISPLACEMENT PUMPS
F04D29/00
Details, component parts, or accessories
F04D29/26
Rotors specially for elastic fluids
F04D29/32
for axial flow pumps
F04D29/321
for axial flow compressors