US PATENT SUBCLASS 291 / 13
.~ Air ports and screens

Current as of: June, 1999
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291 /   HD   TRACK SANDERS

3  DF  FLUID DELIVERY {7}
13.~ Air ports and screens

DEFINITION

Classification: 291/13

Special forms of ports in blast-nozzles to impart a special form to the air-jet or to prevent sand from backing up into the blast-nozzle and screens or strainers for preventing the sand from backing up through the blast-nozzles.