72282145
Oct 9, 1967
Mar 11, 1969
APPARATUS AND INSTRUMENTS USED FOR PHASE MEASURMENTS IN ELECTROMAGNETIC PROSPECTING FOR ORE-NAMELY, FIELD GENERATING CABLES, PICK-UP COILS, COMPENSATOR-AMPLIFYING UNITS, EAR PHONES, GENERATING SETS, CONTROL BOXES, AND CONNECTING CABLES
Fancy Goods