US PATENT SUBCLASS 122 / 134
.~ Volute

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

44.1  DF  FIRE TUBE {11}
134.~ Volute

DEFINITION

Classification: 122/134

(under subclass 44) Devices in which the tubes are in the form of a volute.

SEE OR SEARCH THIS CLASS, SUBCLASS:

261, for water tubes of similar form. (See also the search notes thereunder.)