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Device acting as a valve insert
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Patent number 5,762,319
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Issue date Jun 9, 1998
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Volker Kopp
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B65 - CONVEYING PACKING STORING HANDLING THIN OR FILAMENTARY MATERIAL
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Adhesive foam gun
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Patent number 5,683,544
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Issue date Nov 4, 1997
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Volker Kopp
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Dosage gun
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Patent number 4,955,544
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Issue date Sep 11, 1990
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C. Ehrensperger AG
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Volker Kopp
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL