US PATENT SUBCLASS 126 / *
.~ Submerged
Current as of:
June, 1999
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126 /
HD
STOVES AND FURNACES
344
DF
WATER HEATERS
{7}
*
.~ Submerged {3}
367
DF
.~.~
> Portable
366
DF
.~.~
> Closed systems pipes
368
DF
.~.~
> Stationary