US PATENT SUBCLASS 165 / DIG 54
.~.~.~ Movable header (e.g., floating header, etc.)

Current as of: June, 1999
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165 /   HD   HEAT EXCHANGE

DIG 51  DD  HAVING EXPANSION AND CONTRACTION RELIEVING OR ABSORBING MEANS {2}
DIG 52  DD  .~ For cylindrical heat exchanger {6}
DIG 53  DD  .~.~ Flexible or movable header or header element {3}
DIG 54.~.~.~ Movable header (e.g., floating header, etc.) {1}
DIG 55  DD  .~.~.~.~> Including guiding means for movable header {1}