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Level
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Patent number 5,199,177
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Issue date Apr 6, 1993
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Stanley Tools, a Division of The Stanley Works
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Walter J. Hutchins
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G01 - MEASURING TESTING
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Lighted torpedo level
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Patent number D332226
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Issue date Jan 5, 1993
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Stanley Tools, a Division of The Stanley Works
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Walter J. Hutchins
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D10 - Measuring, testing, or signalling instruments
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Level vial holder assembly
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Patent number 5,033,199
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Issue date Jul 23, 1991
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The Stanley Works
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John H. Wilcox
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G01 - MEASURING TESTING