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1. Television (1939-1957) - Ad*Access Research Guide - LibGuides at Duke University

   https://guides.library.duke.edu/c.php?g=480747&p=3321107

   Getting Started Beauty and Hygiene (1911-1956) Radio (1922-1956) Television (1939-1957) Transportation (1938-1957) Toggle Dropdown Rental Cars (...)

2. The Outer Limits of Aspect Ratios - Bitstreams: The Digital Collections Blog

   https://blogs.library.duke.edu/bitstreams/2017/02/16/outer-limits-aspect-ratios/

   So, if you owned a 20” CRT ( cathode ray tube ) TV back in the olden days, like say 1980, the broadcast image on the (...)

3. Videotelephony, Better Late than Never - Bitstreams: The Digital Collections Blog

   https://blogs.library.duke.edu/bitstreams/2020/05/08/videotelephony-better-late-than-never/

   It wasn’t until the late 1930s that cathode-ray-tube television sets were introduced to the world, and the concept of (...)

4. Bitstreams: The Digital Collections Blog - Page 19 of 36 - Notes from the Duke University Libraries

   https://blogs.library.duke.edu/bitstreams/page/19/

   So, if you owned a 20” CRT ( cathode ray tube ) TV back in the olden days, like say 1980, the broadcast image on the (...)

5. Bitstreams: The Digital Collections Blog - Page 5 of 36 - Notes from the Duke University Libraries D

   https://blogs.library.duke.edu/bitstreams/page/5/

   It wasn’t until the late 1930s that cathode-ray-tube television sets were introduced to the world, and the concept of (...)