US PATENT SUBCLASS 236 / 29
.~.~ Relay, puppet

Current as of: June, 1999
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236 /   HD   AUTOMATIC TEMPERATURE AND HUMIDITY REGULATION

20 R  DF  CLOSED FLUID HEATERS {8}
26 R  DF  .~ Pressure-operated {11}
29.~.~ Relay, puppet

DEFINITION

Classification: 236/29

(under subclass 26) Devices in which at a given pressure a puppet-valve opens, allowing pressure from the boiler to operate a motor, which actuates the heat-controlling means.