US PATENT SUBCLASS 52 / 145
.~ Absorbing material behind foraminous facing sheet

Current as of: June, 1999
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52 /   HD   STATIC STRUCTURES (E.G., BUILDINGS)

144  DF  WITH EXPOSED CONFIGURATION HAVING ACOUSTICAL FUNCTION {1}
145.~ Absorbing material behind foraminous facing sheet

DEFINITION

Classification: 52/145

(under subclass 144) Structure wherein a perforated exposed

sheet conceals a sound absorbing material.