Helge Hoyer

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Birkerod, DK

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Patents Grantslast 30 patents

Information Patent Grant
Fire retardant plate material
- Patent number 4,119,755
- Issue date Oct 10, 1978
- Rockwool International A/S
- Helge Hoyer
- E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL LADDERS