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Electromechanical, electro optic and optic 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 optic and optic sensors, calibration and checking devices for electromechanical, electro optic and optic sensors, resonator elements, crystal scales, electro acoustic components, capacitive, inductive and resistive measuring transformers