Removable utility frame for suspended ceilings
United States Patent 3383811

Inventors:
Ades, William H.
Publication Date:
05/21/1968
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Assignee:
ANNING JOHNSON COMPANY
Primary Class:
52/28
Other Classes:
49/465, 52/210, 52/204.100, 292/114, 52/506.060, 49/394, 362/150
International Classes:
E04B9/00
US Patent References:
3308288Suspended ceiling construction
Foreign References:
GB190601210A
GB602489A