Published by Electrad Inc., July, New York, 1927
Seller: Bergoglio Libri d'Epoca, RIVALBA, TO, Italy
Octavo (220 mm) 24 pages. First editon, very scarce. "A Helpfurl Bookelt desiged to aid the Radio Experimenter and Set Builder in getting Most Efficient Control for Radio Receivers and Battery Eliminators". With 23 figures B/W. Old stamp. Original printed wrappers, staple-bound. A fine copy. All books are in stock in fine condition or described meticulously. Very safe packaging.