E. F. Johnson Company Catalog. Johnson Broadcast and Commercial Radio, Transmitting Equipment, Catalog No. 301. Material: paper. Size: 8 1/2" W. x 11" H. Description: black and white cover - white print: "Johnson Broadcast and Commercial Radio, Transmitting Equipment, Catalog 301, E.F. Johnson Company, Waseca, Minn U.S.A." - 11 pages.