Method of and apparatus for the investigation of...

Details Method of and apparatus for the investigation of... Method of and apparatus for the investigation of...

G - Physics

02

B

73/51.4

G02B 23/26 (2006.01) E21B 47/00 (2006.01) E21B 47/12 (2006.01) G02B 23/24 (2006.01)

Patent

CA 1233662

ABSTRACT OF THE DISCLOSURE A method of and an apparatus for investigating subterranean boreholes especially in bituminous coal mining. Optical fiber cables carry light for illuminating the hole into the latter and an image of the wall of the borehole from the latter to an evaluating means external of the borehole.

482939

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