US PATENT SUBCLASS 165 / DIG 145
.~.~ Radially extending hollow arm on rotating shaft traverses furnance shelf (e.g., rabble arm, etc.)

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165 /   HD   HEAT EXCHANGE

DIG 135  DD  MOVABLE HEAT EXCHANGER {4}
DIG 139  DD  .~ Fully rotatable {5}
DIG 145.~.~ Radially extending hollow arm on rotating shaft traverses furnance shelf (e.g., rabble arm, etc.) {1}
DIG 146  DD  .~.~.~> Angled blade suspended from arm for advancing material