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Valve Adverts, Boxes and Brands
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Economic Electric
Valve List
Xtraudion Advert.
•Modern Wireless,
•July, 1923.
Xtraudion Advert.
•Modern Wireless,
•October, 1923.
Xtraudion Advert.
•Wireless Weekly,
•December 12, 1923.
Xtraudion Advert.
•Wireless Weekly,
•May 7, 1924.
Xtraudion Advert.
•Wireless Weekly,
•August 20, 1924.
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