Acoustical ceiling panel

Details Acoustical ceiling panel Acoustical ceiling panel

1979-09-27

1981-10-20

Word, A. Hugo

Building units and construction elements

Structure

Simulative

D2501

Patent

active

D02614359

REFERENCES:
patent: D79517 (1929-10-01), Haley
patent: D222855 (1972-01-01), Kamrath et al.
patent: D244803 (1977-06-01), Kies

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