US PATENT SUBCLASS 122 / 240.2
.~.~ Series connected

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

235.11  DF  WATER TUBE {52}
240.1  DF  .~ Having plural fireboxes {2}
240.2.~.~ Series connected

DEFINITION

Classification: 122/240.2

Series-connected:

(under subclass 240.1) Devices wherein the multiple fireboxes are connected end to end in a sequence.