US PATENT SUBCLASS 122 / 163
.~.~ Exterior drum

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

135.1  DF  FLUE {4}
155.1  DF  .~ Vertical {16}
163.~.~ Exterior drum

DEFINITION

Classification: 122/163

(under subclass 155) Vertical flue boilers having a steam or water drum located outside of the main boiler structure.

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20, for similar art.