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Safety switch arrangement
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Patent number 5,777,834
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Issue date Jul 7, 1998
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Leuze electronic GmbH + Co.
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Werner Lehner
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G05 - CONTROLLING REGULATING
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Digital welder control system
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Patent number 4,104,724
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Issue date Aug 1, 1978
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Square D Company
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James Allen Dix
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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3774056
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Patent number 3,774,056
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Issue date Nov 20, 1973
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G05 - CONTROLLING REGULATING
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3214695
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Patent number 3,214,695
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Issue date Oct 26, 1965
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G06 - COMPUTING CALCULATING COUNTING