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Mail piece stiffness detector
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Patent number 7,669,470
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Issue date Mar 2, 2010
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Siemens Industry, Inc.
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David M. Sanford
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B07 - SEPARATING SOLIDS FROM SOLIDS SORTING
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Letter-mail checking device
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Patent number 4,687,106
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Issue date Aug 18, 1987
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Staat der Nederlanden (Staatsbedrijf der Posterijen, Telegrafie en Telefonie)
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Geert J. Prins
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B07 - SEPARATING SOLIDS FROM SOLIDS SORTING
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3712468
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Patent number 3,712,468
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Issue date Jan 23, 1973
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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3202778
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Patent number 3,202,778
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Issue date Aug 24, 1965
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B07 - SEPARATING SOLIDS FROM SOLIDS SORTING
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3035695
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Patent number 3,035,695
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Issue date May 22, 1962
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B07 - SEPARATING SOLIDS FROM SOLIDS SORTING