Answer:
1919 Walter Schottky invents the first multiple grid vacuum tube, the tetrode.
Explanation:
#i hope its helped
#Brainless answer
#carry on learning
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Answers & Comments
Answer:
1919 Walter Schottky invents the first multiple grid vacuum tube, the tetrode.
Explanation:
#i hope its helped
#Brainless answer
#carry on learning