E. F. Johnson Company Product in the Field. 6 1/2" x 4 1/4" black and white photograph of early E. F. Johnson Co. radio equipment, for police station communications; labeled only as E. F. Johnson Co., no branding or other logo identification; shown installed in the trunk of a police car or squad car. See same equipment displayed on table in Accession 8.05.500. Trunk mounted portion of the mobile police radio equipment.