US PATENT SUBCLASS 48 / 185
.~ Gravity

Current as of: June, 1999
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48 /   HD   GAS: HEATING AND ILLUMINATING

180.1  DF  MIXERS {9}
185.~ Gravity

DEFINITION

Classification: 48/185

Devices where a body connected to and operating the supply-valves for the gases or gas and air is made buoyant by the specific gravity of the gas.