US PATENT SUBCLASS 138 / 41
.~.~ With screen
Current as of:
June, 1999
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138 /
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PIPES AND TUBULAR CONDUITS
37
DF
WITH FLOW REGULATORS AND/OR BAFFLES
{3}
40
DF
.~ Restrictors {4}
41
.~.~ With screen
DEFINITION
Classification: 138/41
(under subclass 40) Pipes which have a screen in the line of flow in addition to the restrictor.