UMAN hair, paper, cork, wood, seaweed, and a special kind of stone make up the walls of an absolutely nonresonant studio, in Utrecht. Between each wall there is a complete vacuum. The inner walls are hung with "a vari ety of tissues."
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https://paperspast.natlib.govt.nz/periodicals/RADREC19331013.2.23
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Radio Record, Volume VII, Issue 14, 13 October 1933, Page 9
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42Untitled Radio Record, Volume VII, Issue 14, 13 October 1933, Page 9
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