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Slide fastener
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Patent number 4,418,449
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Issue date Dec 6, 1983
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Optilon W. Erich Heilmann GmbH
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Helmut Heimberger
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Fastener
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Patent number 4,172,308
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Issue date Oct 30, 1979
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Optilon W. Erich Heilmann GmbH
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Helmut Heimberger
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A44 - HABERDASHERY JEWELLERY
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Fastener
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Patent number 4,117,575
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Issue date Oct 3, 1978
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Optilon W. Erich Heilmann GmbH
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Helmut Heimberger
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A44 - HABERDASHERY JEWELLERY
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