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888 pages, Hardcover
First published May 1, 2016
'The popular anticipation of pocket wireless telephones by means of which a passenger flying in an aeroplane over France or Italy might "ring up" a friend walking about the streets of London with a receiver in his pocket cannot be said to have been as yet practicality realized but there is nothing inconceivable or even impracticable about such an achievement and the progress of wireless telephony seems to be pointing in that direction.' (p. 382)