US PATENT SUBCLASS 454 / 902
AIR RAID SHELTER VENTILATION

Current as of: June, 1999
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454 /   HD   VENTILATION

902AIR RAID SHELTER VENTILATION

DEFINITION

Classification: 454/902

AIR RAID SHELTER VENTILATION:

(under the class definition) Subject matter comprising means to ventilate a space which is intended to protect its occupants from an attack by hostile military aircraft or missiles.