MANDREL INDUSTRIES, INC.

AUTOMAN

GEOPHYSICAL SIGNAL RECORDING INSTRUMENTS;

ELECTRO-TECH

HYDROPHONES, SEISMOMETERS, GALVANOMETERS, OSCILLOGRAPHS, PHOTOGRAPHIC DEVELOPING UNITS COMPRISING A COMPACT CASE WITH SOLUTION CANS AND LIGHT-PROOF HOODS, ELECTRONIC TESTING INSTRUMENTS TO EVALUATE THE TRANSIENT CHARACTERISTICS OF ELECTRONIC EQUIPMENT, CALIBRATED INSTRUMENTS TO SIMULATE LABORATORY CONDITIONS FOR LABORATORY MEASUREMENTS, AND METAL HOUSINGS, CASINGS AND RACKS ADAPTED FOR USE WITH THE AFORESAID INSTRUMENTS;

M

GEOPHYSICAL APPARATUS-NAMELY, HYDROPHONES, SEISMOMETERS, GALVANOMETERS, OSCILLOGRAPHS, PHOTOGRAPHIC DEVELOPMENT UNITS, ELECTRONIC TESTING INSTRUMENTS, CALIBRATED INSTRUMENTS TO SIMULATE LABORATORY CONDITIONS FOR LABORATORY MEASUREMENTS, AND METAL HOUSINGS, CASINGS, AND RACKS ADAPTED FOR USE WITH THE AFOREMENTIONED INSTRUMENTS, PHOTOELECTRIC SORTING MACHINES, AND WELL LOGGING EQUIPMENT-NAMELY, GAMMA AND NEUTRON RAY LOGGERS, DRY WALL PROBES, ELECTRICAL LOGGING PROBES, RESISTIVITY PROBES, SELF-POTENTIAL PROBES, SONIC PROBES, BORE HOLE CALIPERS, AND DOWNHOLE RECORDERS;THE DRAWING IS LINED TO INDICATE GRAY COLORING;

THUMPER

GEOPHYSICAL EXPLORATION EQUIPMENT-NAMELY DEVICES FOR GENERATING AND RECEIVING SEISMIC WAVES;