US PATENT SUBCLASS 122 / 235.31
.~ Having specific intenal drum and head structure

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

235.11  DF  WATER TUBE {52}
235.31.~ Having specific intenal drum and head structure

DEFINITION

Classification: 122/235.31

Having specific internal drum and head structure:

(under subclass 235.11) Device wherein there is specific structure to the steam drum and central connection for the fluid circulation system.