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Pre-1920
    
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AU3

 

Audion

 

B

 

C

 

C100A

 

CF185

 

D

 

DeForest

 

Edison Effect

 

Fleming

 

Fleming Diode

 

Horned

 

MR1

 

N

 

Q

 

R 2

 

R Type

 

R.4

 

R5

 

T15

 

TM

 

Type A

 

V24

 

VT.1A

 

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