. The Bell System technical journal. Telecommunication; Electric engineering; Communication; Electronics; Science; Technology. 10 BELL SYSTEM TECHNICAL JOURNAL. Fig. 14—von Ardenne-Hartel, 1930—tube by Leybold's Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original American Telephone and Telegraph Company. [Short Hills, N. J. , etc. , American Telephone and Telegraph Co. ]

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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1