-
-
-
-
-
-
-
Flexible shaft and roof drilling system
-
Patent number 4,290,494
-
Issue date Sep 22, 1981
-
The United States of America as represented by the United States Department o...
-
John H. Blanz
-
E21 - EARTH DRILLING MINING
-
Torquer/thruster
-
Patent number 4,273,199
-
Issue date Jun 16, 1981
-
John H. Blanz
-
E21 - EARTH DRILLING MINING
-
Torquer/thruster
-
Patent number 4,262,756
-
Issue date Apr 21, 1981
-
John H. Blanz
-
E21 - EARTH DRILLING MINING
-
Flexible shaft for a roof drill
-
Patent number 4,057,115
-
Issue date Nov 8, 1977
-
The United States of America as represented by the Secretary of the Interior
-
John Blanz
-
B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR