By Alan Douglas This monumental 3 volume work offers an outline history for each of the major radio manufacturers of the 1920’s. It features the company principals and their factories, the financial ups and downs of the industry, and hundreds of pictures of radios produced up to 1930. Over 250 pages each volume. 2.0 lbs. Vol. 1 A-C Dayton through J.B Ferguson Vol. 2 Freed Elsemann through Preiss (B-534) Vol. 3 RCA through Zenith (B-567)