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FLUTTER VALVE AND METHOD OF MAKING SAME
US 3,491,791 A
Filed
: 01/19/1968
Issued
: 01/27/1970
Est. Priority Date
: 01/19/1968
Status: Expired due to Term
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Current Assignee
Polk Edwin Rico
Original Assignee
Polk Edwin Rico
Inventors
POLK EDWIN RICO
Application Number
US04/699,992
Time in Patent Office
739 Days
Field of Search
US Class Current
137/844
CPC Class Codes
F16K 15/147
the closure elements having...
Y10T 137/788
Having expansible port
Y10T 137/7882
Having exit lip
Y10T 156/1002
with permanent bending or r...
Y10T 156/1052
with cutting, punching, tea...
Y10T 29/49416
with material shaping or cu...
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