| 摘要 |
614,455. Sound-absorbent sheathings. INDUSTRIA OSAKEYHTIO. June 11, 1946, No. 17489. Convention date, June 20, 1945. [Class 64 (ii)] Resonance-absorbing air-spaced panels for application to walls and ceilings 1 are formed of perforated cardboard 2 backed by porous paper 5 perforated with holes smaller than those of the cardboard, the folded sides 3 of the panels serving for fixing to the wall or ceiling. The panels flatten out for storage. |
