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Check valve having closed internal circuit hydraulic system
US 2,927,604 A
Filed
: 10/09/1956
Issued
: 03/08/1960
Est. Priority Date
: 10/09/1956
Status: Expired due to Term
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Current Assignee
Harold E. Johnson
Original Assignee
Harold E. Johnson
Inventors
Johnson, Harold E.
Application Number
US03/614,941
Time in Patent Office
1,246 Days
Field of Search
US Class Current
137/514.5
CPC Class Codes
F16K 15/063
the valve being loaded by a...
F16K 17/04
spring-loaded
Y10T 137/7852
End of valve moves inside d...
Y10T 137/7932
Valve stem extends through ...
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