The light bulbs and vacuum tubes used to be the amplifier in radios. They worked like transistors but were never "called transistors"(I gues it is because they are not semiconductors. But that could just be my idea.)
Edison's lab was absolutely instrumental in developing a commercially viable incandescent light bulb, but Edison didn't actually invent the first light bulb. There were several others who preceded his lab's work, such as de Moleyns, Swan and Woodward & Evans. Edison bought the rights to the earlier patent of Woodward and Evans and he partnered with Swan to avoid disputed claims. You might even claim Volta produced the first incandescent light.
The 'discovery of the light bulb' could refer to the carbon arc lamp which had two electrodes. 'Edison's light bulb' then came along which used a filament in a (pure) vacuum and was probably 'one of the first uses of vacuum tubes for electrical applications'.
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