US PATENT SUBCLASS 122 / 235.35
.~ With serial multiple fireboxes

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

235.11  DF  WATER TUBE {52}
235.35.~ With serial multiple fireboxes

DEFINITION

Classification: 122/235.35

With serial multiple fireboxes:

(under subclass 235.11) Devices wherein a plurality of combustion chambers are arranged in succession.