Number of sheets: 5
E. F. Johnson Company Design File Data Sheets. Johnson Socket Design File, Catalog Numbers 124-107 through 124-112, Available Summer 1957; Viking Navigator Design File, Catalog Number 240-126, Delivery Date October 1957; Viking Thunderbolt Design File, Catalog Number 240-353, Delivery Date October 1957; Directional Coupler and Indicator Design File, Catalog Number 250-37 and 250-38, Delivery Date August 1957; T-R Switch Automatic Electronic Antenna Transfer Switch Design File, Catalog Number 250-39, Delivery Date August 1957.
