US PATENT SUBCLASS 165 / DIG 310
.~.~ Heat exchanger located at housing inlet or outlet
Current as of:
June, 1999
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165 /
HD
HEAT EXCHANGE
DIG 228
DD
WITH FAN OR PUMP
{3}
DIG 302
DD
.~ Rotary gas pump {7}
DIG 310
.~.~ Heat exchanger located at housing inlet or outlet