An apparatus and method for extinguishing a fire in a burning building includes a hollow, conically-shaped, hardened metallic device attached to an articulating arm of a boom. The device is provided with plural nozzles formed through its outer surface. The device is impelled from the articulating arm...http://www.google.com.hk/patents/US6840330?utm_source=gb-gplus-share專利 US6840330 - Apparatus and method of extinguishing fires
