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Radio, miracle of the 20th century ... a story of human achievement that stands unrivalled in the history of humanity, together with a colorful portrayal, giving a broad, general view of the whole subject of wireless telegraph and telephone and its marvelous development (1922)

Drinker, Frederick E. [from old catalog], Lewis, James G., [from old catalog] joint author · [Philadelphia, Printed by National publishing co.] · leaf 233

An illustration from Radio, miracle of the 20th century ... a story of human achievement that stands unrivalled in the history of humanity, together with a colorful portrayal, giving a broad, general view of the whole subject of wireless telegraph and telephone and its marvelous development, 1922, leaf 233
Plate Filament \6rid ToPkte^ToGrid Fig. 6. The most important of these is the vacuum or electrontube, which involves but one principle of constructionthough made in variable forms and degrees of efficiencycontrol and power. It has previously been described butthe diagram (Figure 6) will make clear…

Radio

Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.

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