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Drainage system for airports and highways
US 2,649,720 A
Filed
: 03/04/1947
Issued
: 08/25/1953
Est. Priority Date
: 03/04/1947
Status: Expired due to Term
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3
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3 Citations
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Current Assignee
Carl J. Heltzel
,
Company The Union Savings TRUS
Original Assignee
Carl J. Heltzel
,
Company The Union Savings TRUS
Inventors
COMPANY THE UNION SAVINGS TRUS
,
Heltzel, Carl J.
Application Number
US02/732,169
Time in Patent Office
2,366 Days
Field of Search
US Class Current
404/2
CPC Class Codes
E01C 11/02
Arrangement or construction...
E01C 11/227
Gutters; Channels E01C11/22...
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