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American Aerospace Controls, a women-owned small business established in 1965, designs and manufactures a complete line of current, voltage, power and frequency sensors and transducers. A number of these have been specifically designed for and are in use in the rail transit industry. These devices are designed and produced to meet the severe climatic, dynamic and electromagnetic environments encountered in rail transit applications. The company says its sensors and transducers perform to high standards of quality and reliability, and offer excellent performance in accuracy, response times, supply protection, etc. The company's new differential current sensors can detect leakage currents of \<5ma at current levels greater than 2,000 amperes.