Phone / CW / Net / Cal Sensitivity Volume Phone, 2x Fil & PL current meter Amperemeter Zijaanzicht van een Vreeburg A-2M bommenwerper op vliegveld Soesterberg voorjaar 1919 Funk und Ton : Monatsheft für Hochfrequenztechnik und Elektroakustik Marconi ... : a catalogue showing a complete range of radio equipment available from The Marconi Company Limited, Chelmsford, Essex, England Radio-links ... / [Thompson-CSF, Division "Faisceaux Hertziens"] jane's yearbooks Jane's military communications radio amateur's handbook / by the Headquarters staff of the American Radio Relay League
