US PATENT SUBCLASS 122 / 367.4
.~ Pebble furnaces

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

367.1  DF  HEAT TRANSMITTER {3}
367.4.~ Pebble furnaces

DEFINITION

Classification: 122/367.4

Pebble furnaces:

(under subclass 367.1) Devices wherein the heat transmitting tube contains granular material to hold the heat.