A method of manufacturing a composite cover for a sound absorbing member and the composite coating layer.
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Composite cover for schallabsor beer element.
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Sound-absorbing element.
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Sound-absorbing element installed in ceiling of room of public building, has intermediate layers which are designed to create communicating connection between micro-perforation of cover layer and through-passages in substrate layer
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Sound absorbing noise barriers.
CH702932A1
Transparent or translucent sound absorbing plate-shaped element for use with wall element for noise barrier, have one and another sound absorbing covering layer and internal bearing core
