U.S. federal trademark · Serial No. 74011512 · Reg. No. 1612828
STRUCTURAL GEOPHYSICAL INSTRUMENTS, NAMELY, INCLINOMETERS, TILTMETERS, PLUMB-LINES, SPIRAL SENSORS, PORE-PRESSURE TRANSDUCERS, PORTABLE PNEUMATIC INDICATORS, ELECTRICAL PIEZOMETER PRESSURE SENSORS, WATER LEVEL INDICATORS, WATER SAMPLERS, BORE HOLE EXTENSOMETERS, STRAIN METERS, TAPE EXTENSOMETERS, AND SETTLEMENT PROBES; AND VIBRATION MONITORING INSTRUMENTS, NAMELY, GROUND VIBRATION SENSORS, LOAD CELLS, STRAIN GAUGES, AND VIBRATING WIRE STRAIN GAUGES
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