US PATENT SUBCLASS 237 / 60
.~.~ Geyser boiler

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

56  DF  WATER {5}
59  DF  .~ Circulation {4}
60.~.~ Geyser boiler

DEFINITION

Classification: 237/60

(under subclass 59) Subject matter in which the water is heated and forced out of a boiler by intermittent pulsations.