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PACKER CONSTRUCTION
US 3,472,520 A
Filed
: 02/01/1966
Issued
: 10/14/1969
Est. Priority Date
: 02/01/1966
Status: Expired due to Term
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Current Assignee
Erwin Burns
Original Assignee
Erwin Burns
Inventors
Burns, Erwin
Application Number
US04/536,200
Time in Patent Office
1,351 Days
Field of Search
US Class Current
277/339
CPC Class Codes
E21B 33/1212
including a metal-to-metal ...
E21B 33/128
with a member expanded radi...
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