The principles of electric wave telegraphy and telephony
FLEMING(J.A.)
The principles of electric wave telegraphy and telephony - 4th ed. - London Longmans Green & Co. 1919 - xvi p. + 707
The principles of electric wave telegraphy and telephony - 4th ed. - London Longmans Green & Co. 1919 - xvi p. + 707