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Home › Roof structure comprising a roof penetrating installation, an external roof covering, an underroof and a fitting collar for sealingly joining said installation with said underroof and a method for the manufacture of said fitting collar

Roof structure comprising a roof penetrating installation, an external roof covering, an underroof and a fitting collar for sealingly joining said installation with said underroof and a method for the manufacture of said fitting collar

US Patent 5718088 · Granted Feb 17, 1998

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