Production years
ID: 640355
This article refers to the component: To the tube/semiconductor
Production years
14.Nov.23 14:23
675
I found this press ad form 16.X.1927 form "RAdjo - tygodnik ilustrowany dla wszystkich"
It says that PTR presented this tube on Warsaw Radio Fair in autumn 1927
[I can't upoad the ad, it can be found here
To thank the Author because you find the post helpful or well done.