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Pipeline scraper-locator transmitter
US 2,820,959 A
Filed
: 03/05/1956
Issued
: 01/21/1958
Est. Priority Date
: 03/05/1956
Status: Expired due to Term
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Current Assignee
James E. Bell
Original Assignee
James E. Bell
Inventors
Bell, James E.
Application Number
US03/569,579
Time in Patent Office
687 Days
Field of Search
US Class Current
324/67
CPC Class Codes
G01M 3/005
using pigs or moles G01M3/2...
G01V 15/00
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