US PATENT SUBCLASS 122 / 235.33
.~ With convection zone regulation
Current as of:
June, 1999
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122 /
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LIQUID HEATERS AND VAPORIZERS
235.11
DF
WATER TUBE
{52}
235.33
.~ With convection zone regulation
DEFINITION
Classification: 122/235.33
With convection zone regulation:
(under subclass 235.11) Devices wherein means are provided to control the flow of combustion gases.