Economic Electric

Valve List

Xtraudion Advert. •Wireless World •April 28, 1923.

Xtraudion Advert. •Modern Wireless •July, 1923.

Xtraudion Advert. •Modern Wireless •October, 1923.

Xtraudion Advert. •Wireless Weekly •December 12, 1923.

Xtraudion Advert. •Radio Valves and How to Use Them •January, 1924.

Xtraudion Advert. •Modern Wireless •March, 1924.

Xtraudion Advert. •Wireless Weekly •May 7, 1924.

Xtraudion Advert. •Wireless Weekly •August 20, 1924.

Dextraudion