US PATENT SUBCLASS 237 / 11
.~ Compressed air

Current as of: June, 1999
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237 /   HD   HEATING SYSTEMS

2 R  DF  AUTOMATIC CONTROL {9}
11.~ Compressed air

DEFINITION

Classification: 237/11

(under subclass 2) Automatic control in which air is compressed and thereby heated and circulated through the radiators.