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Soluble polymer interleaving material
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Patent number 5,026,597
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Issue date Jun 25, 1991
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PPG Industries, Inc.
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Helmut Franz
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B65 - CONVEYING PACKING STORING HANDLING THIN OR FILAMENTARY MATERIAL
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Pressing plastic with extensible coating
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Patent number 4,454,203
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Issue date Jun 12, 1984
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PPG Industries, Inc.
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Helmut Franz
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B05 - SPRAYING OR ATOMISING IN GENERAL APPLYING LIQUIDS OR OTHER FLUENT MATER...
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Plastic surface treatment
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Patent number 4,332,861
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Issue date Jun 1, 1982
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PPG Industries, Inc.
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Helmut Franz
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C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
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