Influences on the early development of radio transmitters

Abstract
The radio transmitters considered here are those which did not use thermionic valves as oscillating elements. Even with this limitation, the subject is a wide one, covering three decades of development. No attempt has been made, therefore, to list every transmitter of the period, but, instead, a few particularly significant equipments in the light of the political and commerical policies which affected their technical designs are described.

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