Installation, maintenance, and repair of seismological instruments, computer peripheral devices for seismological instruments, computer systems in the field of seismology and of seismic monitoring systems; installation, maintenance, and repair of structural monitoring systems; installation, maintenance, and repair of seismic monitoring systems for nuclear power plants; installation, maintenance, and repair of earthquake monitoring systems, induced seismicity systems, volcano monitoring system...

Scientific instruments used in the Geophysical-Geological and Earthquake Engineering fields-namely, Accelerographs, Seismic Sensors, Accelerometers, Seismic Triggers, Seismic Switch Accessory Panels; [Graphic and] Digital Recorders, Multi-Channel Digital Recorders; Signal Conditioners, Amplifier Filters, Transducers; data acquisition software and seismological instruments for data acquisition, alarms for indicating seismological events; Instrument Housings; Environmental Monitoring Digitizers...

Scientific Instruments Used in the Geophysical-Geological Fields-Namely, Accelerographs, Seismic Sensors, Accelerometers, Seismic Triggers, Tiltmeters, Seismoscopes, Seismic Switch Accessory Panels; Graphic and Magnetic Recorders, Multi-Channel Photographic Recorders; Signal Conditioners, Galvanometers, Amplifier Filters, Digital Timers, Transducers; Time and Frequency Receivers, Antennae, Radio Frequency Transmitters and Receivers, Receiver Circuit Boards and Frequency Comparators; Motor Sha...

SCIENTIFIC INSTRUMENTS USED IN THE GEOPHYSICAL-GEOLOGICAL FIELDS-NAMELY, ACCELEROGRAPHS, SEISMIC SENSING, ACCELEROMETERS, SEISMIC TRIGGERS, VIBRATION SURVEY SYSTEMS, TILTMETERS, SEISMOSCOPES, EARTHQUAKE AND VIBRATION MONITORS; SEISMIC SWITCH ACCESSORY PANELS; RECORDING AND PLAYBACK SYSTEMS, DIGITAL DATA ACQUISITION SYSTEMS UTILIZING COMPUTER COMPATIBLE TAPES, MULTI-CHANNEL PHOTOGRAPHIC RECORDING SYSTEMS; SIGNAL CONDITIONERS, GALVANOMETERS, AMPLIFIER FILTERS, DIGITAL TIMING SYSTEMS, TIME AND F...