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Rotary valves for laboratory glassware and the like
US 2,876,985 A
Filed
: 06/22/1955
Issued
: 03/10/1959
Est. Priority Date
: 06/22/1955
Status: Expired due to Term
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8 Citations
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Current Assignee
George H. Birchall Jr
,
Purdy, James A.
Original Assignee
George H. Birchall Jr
,
Purdy, James A.
Inventors
Birchall, George H. Jr.
,
Purdy, James A.
Application Number
US03/517,214
Time in Patent Office
1,357 Days
Field of Search
US Class Current
251/192
CPC Class Codes
F16K 27/062
with conical plugs
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