0 vistas · 10/04/25
0 vistas · 10/04/25
The blue LED was almost impossible to make
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0 vistas·
10/04/25
LED's don't get their colour from their plastic covers. The blue LED was supposed to be impossible—until a young engineer proposed a moon-shot idea.
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0 vistas · 10/04/25
0 vistas · 10/04/25
