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Iphofen, DT
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Patent Grant
Process for the manufacture of stabilized, hardenable calcium sulph...
Patent number
4,039,616
Issue date
Aug 2, 1977
Gebr. Knauf Westdeutsche Gipswerke
Kurt Scheel
C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
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Patent Grant
Multi-layer plasterboard
Patent number
3,993,822
Issue date
Nov 23, 1976
Gebr. Knauf Westdeutsche Gipswerke
Alfons Knauf
B28 - WORKING CEMENT, CLAY, OR STONE
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