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Solid state relay
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Patent number 6,291,909
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Issue date Sep 18, 2001
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HLO, L.L.P.
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Michael P. Olsen
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H03 - BASIC ELECTRONIC CIRCUITRY
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DC solid state relay
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Patent number 6,091,166
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Issue date Jul 18, 2000
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HLO, L.L.P.
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Michael P. Olsen
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H03 - BASIC ELECTRONIC CIRCUITRY
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Loudspeaker enclosure
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Patent number 4,924,964
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Issue date May 15, 1990
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Michael P. Olsen
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H04 - ELECTRIC COMMUNICATION TECHNIQUE