Biodiversity Heritage Library · page-17246094
The Bell System technical journal — Illustration, Page 248
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BHL classifies this scanned page as Illustration. Publication: The Bell System technical journal. Publication creators (not identified as the page's illustrator): American Telephone and Telegraph Company.. Contributing institutions: Prelinger Library. Bibliographic metadata supplied by BHL under CC0; image rights are separate.
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1938. The Bell System technical journal — Illustration, Page 248. https://www.biodiversitylibrary.org/page/17246094
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