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This is an original 1943 black and white and grayscale print ad for the Bell Telephone Systems, featuring the first effective high-vacuum tube, for amplifying electric currents developed by Bell Laboratiries and Dr. H.D. Arnold.
This 70+ year old Item is rated Very Fine +. No creases. No natural defects. No surface rub. No tears. Heavy water stain - bottom.
Period Paper is pleased to present a collection of vintage ads, covers, prints, and articles from Popular Mechanics magazine from the World War I and World War II eras. To continue browsing this collection, simply click on the link provided beneath the condition paragraph.
Keywords specific to this image: Vintage Advertising