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Subgrading machine
US 3,396,643 A
Filed
: 03/06/1967
Issued
: 08/13/1968
Est. Priority Date
: 03/06/1967
Status: Expired due to Term
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8
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Current Assignee
Koehring Co.
(SPX Corporation)
Original Assignee
Kenneth V. Johnson
Inventors
Johnson, Kenneth V.
Application Number
US04/620,876
Time in Patent Office
526 Days
Field of Search
US Class Current
404/85
CPC Class Codes
E01C 19/00
Machines, tools or auxiliar...
E01C 23/00
Auxiliary devices or arrang...
E02F 9/003
Devices for transporting th...
E02F 9/02
Travelling-gear, e.g. assoc...
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