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References
- ↑ "TR-52 Radio Sony Corporation; Tokyo, build 1955, 1 pictures |Radiomuseum.org". www.radiomuseum.org.
- ↑ "Sony History Chapter6 Transistor's number used the suffix "seki"".
- 1 2 Marsh, Allison (2024-09-30). "The First Transistor Radio: Engineering the Regency TR-1". IEEE Spectrum. Retrieved 2024-10-05.
- ↑ John Nathan (8 March 2001). Sony. Houghton Mifflin Harcourt. pp. 35–. ISBN 0-618-12694-5.
- 1 2 3 Robert Grayson (1 September 2012). Sony: The Company and Its Founders. ABDO Publishing Company. pp. 40–. ISBN 978-1-61480-183-2.
- 1 2 Michael B. Schiffer (1991). The Portable Radio in American Life. University of Arizona Press. pp. 208–. ISBN 978-0-8165-1284-3.
- ↑ "Model TR-55, Sony; Tokyo". Radiomuseum.org. RadioMuseum. Retrieved 9 April 2017.
- 1 2 "TR-55 Product Design". Sony.net. Sony. Retrieved 7 April 2017.
