US PATENT SUBCLASS 122 / 9
.~.~ Water tube type
Current as of:
June, 1999
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122 /
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LIQUID HEATERS AND VAPORIZERS
6 R
DF
INDUSTRIAL
{7}
8
DF
.~ Water firebox {1}
9
.~.~ Water tube type
DEFINITION
Classification: 122/9
(under subclass 8) Industrial boilers including a firebox the walls of which are provided with water containing tubes.