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    The application of precision switches is an intriguing technical subject. It draws upon many disciplines, including solid-state physics, plasma physics, physical chemistry, metallurgy, stress and vibration analysis, circuit analysis, and many others. Yet, it can be expressed in down-toearth common-sense terms, and can be readily understood and applied without specialized background. The three aspects of switch use are mechanical, electrical, and environmental; each is covered in depth in this Honeywell white paper.