TR55 la prima radio commercializzata dalla Sony nel 1955
WCSA - On This Day - August 07, 2018 - Tokyo Telecommunications Engineering, the precursor to Sony, begins selling its first transistor radios in Japan in 1955 - WCSA.WORLD
TR-55 Radio Sony Corporation; Tokyo, build 1955, 7 pictures | Radiomuseum
Sony Group Portal - TIME CAPSULE vol.17
SONY Radio TR-55(1955) | Transistor radio, Transistor radio vintage, Pocket radio
Sony Group Portal - Product & Technology Milestones−Radio