72235947
Jan 7, 1966
Aug 22, 1967
PETTY GEOPHYSICAL ENGINEERING COMPANY
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AMPLIFIERS
SHOT HOLE DRILLS AND MACHINE TOOL ASSEMBLIES FOR SHAPING MATERIALS
ELECTRONIC, GEOPHYSICAL AND SURVEYING EQUIPMENT-NAMELY, DETECTORS FOR USE IN DETECTING, RECORDING AND REPRESENTING SEISMIC DISTURBANCES, SEISMOGRAPHS