US PATENT SUBCLASS 122 / 88
.~.~ Upper drum

Current as of: June, 1999
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122 /   HD   LIQUID HEATERS AND VAPORIZERS

44.1  DF  FIRE TUBE {11}
51  DF  .~ Horizontal {22}
88.~.~ Upper drum

DEFINITION

Classification: 122/88

(under subclass 51) Devices having a superposed horizontal upper-drum.

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50, 486 and 492, for special features.