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Polypropylene spa shell manufacturing method
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Patent number 5,514,315
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Issue date May 7, 1996
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Watkins Manufacturing Corporation
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Jeffrey K. Watkins
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Spa shell
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Patent number D368530
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Issue date Apr 2, 1996
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Watkins Manufacturing Corporation
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Michael E. Lawing
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D24 - Medical and laboratory equipment
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Spa shell
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Patent number D367708
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Issue date Mar 5, 1996
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Watkins Manufacturing Corporation
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Michael E. Lawing
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D24 - Medical and laboratory equipment
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Combined spa and cover
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Patent number D367709
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Issue date Mar 5, 1996
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Watkins Manufacturing Corporation
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Michael E. Lawing
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D24 - Medical and laboratory equipment
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Portable spa cover
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Patent number 5,398,350
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Issue date Mar 21, 1995
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Watkins Manufacturing Corporation
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Jeffrey K. Watkins
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E04 - BUILDING