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VALVES
US 3,463,451 A
Filed
: 11/20/1967
Issued
: 08/26/1969
Est. Priority Date
: 11/20/1967
Status: Expired due to Term
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Current Assignee
Peter A. Treadwell
Original Assignee
Peter A. Treadwell
Inventors
Treadwell, Peter A.
Application Number
US04/684,312
Time in Patent Office
645 Days
Field of Search
US Class Current
251/315.14
CPC Class Codes
F16K 5/0642
the spherical plug being in...
F16K 5/0657
Particular coverings or mat...
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