![File:Vintage Stellar 2-Transistor Boy's Radio, No Model Number, Made in Japan, Circa 1961 (9634971421).jpg - Wikimedia Commons File:Vintage Stellar 2-Transistor Boy's Radio, No Model Number, Made in Japan, Circa 1961 (9634971421).jpg - Wikimedia Commons](https://upload.wikimedia.org/wikipedia/commons/thumb/4/4b/Vintage_Stellar_2-Transistor_Boy%27s_Radio%2C_No_Model_Number%2C_Made_in_Japan%2C_Circa_1961_%289634971421%29.jpg/807px-Vintage_Stellar_2-Transistor_Boy%27s_Radio%2C_No_Model_Number%2C_Made_in_Japan%2C_Circa_1961_%289634971421%29.jpg)
File:Vintage Stellar 2-Transistor Boy's Radio, No Model Number, Made in Japan, Circa 1961 (9634971421).jpg - Wikimedia Commons
![File:Vintage Stellar 2-Transistor Boy's Radio, Model RA-2, Broadcast Band Only (MW), Made In Japan, Circa 1960s (16243662614).jpg - Wikimedia Commons File:Vintage Stellar 2-Transistor Boy's Radio, Model RA-2, Broadcast Band Only (MW), Made In Japan, Circa 1960s (16243662614).jpg - Wikimedia Commons](https://upload.wikimedia.org/wikipedia/commons/b/bf/Vintage_Stellar_2-Transistor_Boy%27s_Radio%2C_Model_RA-2%2C_Broadcast_Band_Only_%28MW%29%2C_Made_In_Japan%2C_Circa_1960s_%2816243662614%29.jpg)
File:Vintage Stellar 2-Transistor Boy's Radio, Model RA-2, Broadcast Band Only (MW), Made In Japan, Circa 1960s (16243662614).jpg - Wikimedia Commons
![Predicted evolution of the radio flux with rotation, used as proxy for... | Download Scientific Diagram Predicted evolution of the radio flux with rotation, used as proxy for... | Download Scientific Diagram](https://www.researchgate.net/publication/350512592/figure/fig3/AS:1007261983977473@1617161379767/Predicted-evolution-of-the-radio-flux-with-rotation-used-as-proxy-for-stellar-age-for-a.png)