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Michel J. E. Chretien
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Saint Cyr l'ecole, FR
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Patent Grant
Device for at least partly closing a vertical opening in a building...
Patent number
4,811,777
Issue date
Mar 14, 1989
MacGregor-Navire (F) S.A.
Michel J. E. Chretien
E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL LADDERS