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US 2,539,063 A
Filed
: 12/06/1948
Issued
: 01/23/1951
Est. Priority Date
: 12/06/1948
Status: Expired due to Term
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Current Assignee
Edward D. Ekenstam
Original Assignee
Edward D. Ekenstam
Inventors
Ekenstam, Edward D.
Application Number
US03/063,833
Time in Patent Office
778 Days
Field of Search
US Class Current
405/265
CPC Class Codes
E01C 19/4866
with solely non-vibratory o...
E01C 19/4873
Apparatus designed for rail...
E02B 5/02
Making or lining canals lin...
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