Landmarks of Human Thought I - Catalog - Page 31
COOLIDGE William D.: Vacuum
Tube. Patent No. 1,203,495.
Application filed May 09, 1913;
patented October 31, 1916.
Washington D.C.: Norris Peters
Photo-Lithographer for the United
States Patent Office [1916].
Folio (275 x 186 mm) 5 pp. [1r] –
[4v] text, double column, one leaf of
diagrams printed on verso only.
