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The Geotechnical Corporation
1961
LaCoste and Romberg
Lehner-Griffith
1956
Hilger & Watts
1958
Askania-Werke
Evershed & Vignoles
1907
1971
Gtek. Armidale, Australia
2004
Scintrex. Toronto, Canada
1994 (est.)
Geophysical Technology. Armidale, Australia
1989
1987
Geophysical Research Institute. Armidale, Australia
1980
1979
1978
Scintrex
University of New England. Armidale, Australia
1973
1970
Elsec Scientific Instruments, Oxford, England
1967
Jalander
1950-1965
Radar Exploration
Late 1950's (est)
E.R. Watts & Son.
1947
Askania
1930s (Est)
CSIRO Mineral Physics
1972