Electromechanical, electro-optic and optical sensors, pressure sensors, power sensors, acceleration sensors, expansion sensors, expansion measuring strips, measuring devices for measuring of pressure, measuring of power or measuring of acceleration, electronic amplifiers for electromechanical, electro-optical and optical sensors, calibration and checking devices for electromechanical, electro-optical and optical sensors, resonator elements, crystal scales, electroacoustic components, capaciti...