Electrical and electronic apparatus and instruments for supervisory control and data acquisition, namely, electrical controllers, electric sensors, computer hardware, computer monitors, electric meters, printers, and electronic plotters for use in the field of mining and tunneling operations; electrical transducers; printed electronic circuit boards for use in the field of mining and tunneling operations; and structural parts included in this class of all the aforesaid goods, namely, transmitters, probes, gas detectors; all the aforesaid goods being for use in relation to mining or for use with machines or installations associated with mines; electrical and electronic sensors for sensing fluid flow, gas, fluid level, pressure, proximity and vibration; electrical and electronic control systems for gas detection, flow, vibration and pressure applications for use in the field of mining and tunneling operations; sensing systems for sensing fluid flow, gas, fluid level, pressure, proximity, and vibration, having as components, flow meters, gas sensors for measuring gas concentration, liquid level sensors, pressure sensors, proximity sensors, and/or vibration sensors for installation in mines and tunnels; monitors for gas detection, flow, vibration and pressure for applications in the field of mining and tunneling operations; light and/or sound alarms for providing visual and/or audible indication of an equipment malfunction for use in the field of mining and tunneling operations; level indicators; alarm indicators, namely, strobes, sirens, bells, horns, and speakers; calibration due indicators, namely, countdown timer(s) and alarms to remind of the need for calibration of apparatus used in the field of mining and tunneling operations; structural parts and fittings and accessories for all the aforesaid goods, all included in this class, namely, electronic transmitters, probes, gas detectors, all for use in the field of mining and tunneling operations; all of the foregoing excluding devices for use in HVAC applications