Patent classifications
E
FIXED CONSTRUCTIONS
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E04
BUILDING
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E04F
FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
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13/00
Coverings or linings, e.g. for walls or ceilings
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E04F13/07
composed of covering or lining elements; Sub-structures therefor; Fastening means therefor
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E04F13/08
composed of a plurality of similar covering or lining elements,
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E04F13/0867
having acoustic absorption means on the visible surface
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