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The design of switching circuits for industrial control has been developed chiefly in terms of relays. Magnetic logic circuits, which are switching elements based on the single-core magnetic amplifier, have properties different from relays and therefore require somewhat different design methods. One possible form of switching algebra for magnetic logic circuits is suggested and simple examples of its use are given. The steps in designing a complete system are discussed. The advantages of performing the important step of design verification on a simulator are pointed out.