| http://www.w3.org/ns/prov#value | - eing secured to the impervious sheet and the first porous sheet and the [56] Rate I cued honeycomb layer being secured between the first and second UNITED STATES PATENTS P 2,870,857 l/1959 Goldstein ..18l/33 G 7 Claims, 2 Drawing Figures ACOUSTIC LININGS This invention relates to acoustic linings for attenuating the noise produced by engines such as gas turbine engines.
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