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Relay switching apparatus
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Patent number 4,296,449
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Issue date Oct 20, 1981
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General Electric Company
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Charles W. Eichelberger
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G05 - CONTROLLING REGULATING
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3829845
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Patent number 3,829,845
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Issue date Aug 13, 1974
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G05 - CONTROLLING REGULATING
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3714509
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Patent number 3,714,509
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Issue date Jan 30, 1973
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G05 - CONTROLLING REGULATING
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3579226
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Patent number 3,579,226
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Issue date May 18, 1971
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G05 - CONTROLLING REGULATING