Wishart, Neil; Ritter, Kurt
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Wishart, Neil; Rudolph, Alena; Ritter, Kurt
Patent: US2003/109714 A1, 2003 ;

McNeil Labor. Inc.
Patent: US2780633 , 1955 ;

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Marsh; Sam
Patent: US2890985 , 1955 ;

McNeil Labor.Inc.
Patent: US2780633 , 1955 ;