US PATENT SUBCLASS 431 / 73
.~.~ By timer or retarder

Current as of: June, 1999
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431 /   HD   COMBUSTION

18  DF  TIMER, PROGRAMMER, RETARDER OR CONDITION RESPONSIVE CONTROL {26}
72  DF  .~ Of igniter and feed controlled sequence {2}
73.~.~ By timer or retarder

DEFINITION

Classification: 431/73

(under subclass 72) Apparatus including a time interval establishing means.

SEE OR SEARCH THIS CLASS, SUBCLASS:

45, for an igniter deenergized by a timer or retarder in a system in which the sensor of a first burner controls a second burner.