Curve, surface represents analog value, line, surface follower

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    • G05 - CONTROLLING REGULATING
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    3339121

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    • Issue date Aug 29, 1967
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    3265963

    • Patent number 3,265,963
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    3198950

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    3198949

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    3111615

    • Patent number 3,111,615
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    3060332

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    2988682

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    2946939

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    2939321

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    2883653

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    2835858

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    2611115

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    2598937

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    2594716

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    2354391

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    2277502

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    1976298

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    • Issue date Oct 9, 1934
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