Soundproof wall unit

Details Soundproof wall unit Soundproof wall unit

1997-07-07

1999-05-25

Clark, Doris

Building units and construction elements

Architectural stock material

Panel, tile or applique or floor, wall, roof, etc.

2501

Patent

active

D04102916

REFERENCES:
patent: D233832 (1974-12-01), Becker
Forms and Surfaces catalog, ceiling section, p. 13, center of page, left side of illustration, first full tile illustration. Also note lower right side of p. 13, illustration labeled "perforated circles", copyright 1986.

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