• 1931

    Foundation

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  • 1946

    Portal construction

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  • 1963

    New material: UPVC

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  • 1977

    Sarleinsbach plant

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  • 1979

    Three panes, three gaskets

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  • 1979

    Coloured UPVC windows

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  • 1979

    Start of extrusion

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  • 1982

    Lannach plant

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  • 1984

    Start of production of insulating glass

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  • 1966

    First UPVC window production in Austria

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  • 1991

    Changeover from direct sales to specialist trade

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  • 1995

    Upgrade of the Sarleinsbach plant

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  • 1997

    Start of timber/aluminium window production

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  • 1997

    The third generation

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  • 2002

    Founding of IFN

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  • 2002

    Introduction of FIX-O-ROUND technology

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  • 2012

    Introduction of the revolutionary Internorm technologies

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  • 2012

    20 million windows and doors sold

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  • 2013

    HS 330 lift and slide door

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  • 2014

    HK 430 lift and slide door

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  • 2014

    I-tec SmartWindow

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