US PATENT SUBCLASS 169 / 21
.~.~ Lever system

Current as of: June, 1999
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169 /   HD   FIRE EXTINGUISHERS

19  DF  AUTOMATIC VALVES {1}
20  DF  .~ Pressure controlled {2}
21.~.~ Lever system

DEFINITION

Classification: 169/21

(under subclass 20) Apparatus, wherein the pressure on the air-valve is transmitted to the water-valve through a system

of levers or like mechanical elements and usually in increased amount.