Title:
Pneumatically counterbalanced support
United States Patent 2231631
Inventors:
Joseph, Maina
Publication Date:
02/11/1941
Export Citation:
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Assignee:
Joseph, Maina
Primary Class:
248/161
Other Classes:
91/4R
International Classes:
A47B27/16; A61G15/02; A47B27/00; A61G15/00
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