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AUTOMATIC DRILLING SYSTEM
US 3,497,019 A
Filed
: 02/05/1968
Issued
: 02/24/1970
Est. Priority Date
: 02/05/1968
Status: Expired due to Term
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Current Assignee
John E. Ortloff
Original Assignee
John E. Ortloff
Inventors
Ortloff, John E.
Application Number
US04/702,882
Time in Patent Office
750 Days
Field of Search
US Class Current
175/27
CPC Class Codes
E21B 44/005
Below-ground automatic cont...
E21B 44/02
Automatic control of the to...
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