Seismographs; electronic vibration monitors, analyzer and display data loggers for use on buildings; electric vibration sensors, electronic data recorders of vibrations in and around structures caused by man-made and natural sources, downloadable and recorded computer software for analysis and display of blast-related signals, electric blast sensors, blast triggers in the nature of electronic drum triggers, signal amplifiers, probes for measuring detonation velocity and explosives and manuals sold as a unit with aforestated products; power supplies, document and photo printers, plotters and structural parts thereof sold as a unit therewith