US PATENT SUBCLASS 165 / DIG 72
AGITATOR OR IMPELLER MOTOR OPERATED BY FIRST HEAT EXCHANGE FLUID


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165 /   HD   HEAT EXCHANGE

DIG 72AGITATOR OR IMPELLER MOTOR OPERATED BY FIRST HEAT EXCHANGE FLUID {1}
DIG 73  DD  .~> To agitate or move second heat exchange fluid {2}