Samenvatting
In and before two road tunnels measurement are done to the values of noise. One tunnel was built on the usual way, the other one with special acoustic materials. The differences in measurements are given.
In and before two road tunnels measurement are done to the values of noise. One tunnel was built on the usual way, the other one with special acoustic materials. The differences in measurements are given.
Nachtrichten des Lärmbekämpfungszentrums, Februar 1969, p. 1-3
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