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Pneumatic conveyor system
US 2,970,791 A
Filed
: 07/19/1954
Issued
: 02/07/1961
Est. Priority Date
: 07/19/1954
Status: Expired due to Term
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18
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Current Assignee
Gordon H. Cork
,
William J. Hafner
Original Assignee
Gordon H. Cork
,
William J. Hafner
Inventors
Hafner, William J.
,
Cork, Gordon H.
Application Number
US03/444,274
Time in Patent Office
2,395 Days
Field of Search
US Class Current
406/5
CPC Class Codes
B65G 51/44
without mechanical contact ...
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