Title:
Light-permeable sound-absorbing panel
United States Patent 2850109


Inventors:
Allen, Benjamin Reuben
Application Number:
US42585554A
Publication Date:
09/02/1958
Filing Date:
04/27/1954
Assignee:
BENJAMIN ELECTRIC MFG CO
Primary Class:
Other Classes:
362/147
International Classes:
E04B9/00; E04B9/32
View Patent Images: