US PATENT SUBCLASS 128 / 207.12
.~.~.~ Valve for controlling gas flow
Current as of:
June, 1999
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128 /
HD
SURGERY
200.24
DF
RESPIRATORY METHOD OR DEVICE
{32}
206.21
DF
.~ Face mask covering a breathing passage {6}
206.28
DF
.~.~ Covering nose and mouth {3}
207.12
.~.~.~ Valve for controlling gas flow
DEFINITION
Classification: 128/207.12
Valve for controlling gas flow:
(under subclass 206.28) Subject matter including a valve for controlling gas flow.
