Sound shield

Details Sound shield Sound shield

1981-06-26

1983-08-02

Word, A. Hugo

Building units and construction elements

Structure

D15 9, D25 33, D25 35, D2503

Patent

active

D02700026

REFERENCES:
patent: D264719 (1982-06-01), Ehlers
patent: 3276539 (1966-10-01), Dear et al.
patent: 3642092 (1972-02-01), Cederbaum
patent: 4120376 (1978-10-01), Palmer
patent: 4146112 (1979-03-01), Usry
patent: 4359085 (1982-11-01), Mueller

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