Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
John Ding0
Date of Patent
April 10, 2012
0Patent Application Number
128885000
Date Filed
September 23, 2010
0Patent Citations Received
Patent Primary Examiner
0
Patent abstract
Visual inspection of an interior bottom of a borehole by means of measuring the sediment thickness at the bottom. An inspection device to be lowered in the borehole and then to be retrieved. The bottom sediment thickness is marked on the piston by a collar attached to the piston.
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