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==Links== | ==Links== | ||
* | * {{Keller 1991|pp.133-134}} | ||
* [http://www.radiomuseum.org/tubes/tube_154-0698-00.html 154-0698-00 @ radiomuseum.org] | * [http://www.radiomuseum.org/tubes/tube_154-0698-00.html 154-0698-00 @ radiomuseum.org] | ||