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radio
harmsen
W. Harmsen
ir. W. Harmsen
michael egan
radio voor amateurs
radiolamp
egan
kosmos
1926
boek
scan
tube
book
lamp
drie electroden


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Three electrodes lamp

Three electrodes lamp
From the book Radio voor amateurs of 1926. Originally an English book by Michael Egan, translated/reworked into Dutch by ir. W. Harmsen.

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