Strickland, W. H.
Characteristics of ultrasonic ranging sensors in an underground environment / by W.H. Strickland and R.H. King. - Washington, DC : U.S. Dept. of the Interior, Bureau of Mines, 1992. - ii, 39 p. : ill. - Report of investigations ; 9452 . - United States. Bureau of Mines. Report of investigations ; 9452. . - Report of investigations (United States. Bureau of Mines) ; 9452. .
92026918
Mining machinery--Automatic control.
Sonar.
Characteristics of ultrasonic ranging sensors in an underground environment / by W.H. Strickland and R.H. King. - Washington, DC : U.S. Dept. of the Interior, Bureau of Mines, 1992. - ii, 39 p. : ill. - Report of investigations ; 9452 . - United States. Bureau of Mines. Report of investigations ; 9452. . - Report of investigations (United States. Bureau of Mines) ; 9452. .
92026918
Mining machinery--Automatic control.
Sonar.