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ABOVE SURFACE OBSERVED MARKER SECURED TO UNDERGROUND UTILITIES,ETC.TO INDICATE THEIR DEPTH AND DIRECTION
US 3,523,515 A
Filed
: 10/02/1968
Issued
: 08/11/1970
Est. Priority Date
: 10/02/1968
Status: Expired due to Term
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Current Assignee
Clayton S. Brown
Original Assignee
Clayton S. Brown
Inventors
Brown, Clayton S.
Application Number
US04/764,567
Time in Patent Office
678 Days
Field of Search
US Class Current
116/209
CPC Class Codes
G01C 15/04
Permanent marks; Boundary m...
Y10S 116/14
Tapes as carriers
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