US PATENT SUBCLASS 454 / 190
.~ Including plural, layered currents

Current as of: June, 1999
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454 /   HD   VENTILATION

188  DF  HAVING PROTECTING AIR CURRENT {5}
190.~ Including plural, layered currents

DEFINITION

Classification: 454/190

Including plural, layered currents:

(under subclass 188) Subject matter comprising two or more distinct air jets or sheets which are positioned one outside of the other relative to the space being protected.