E. F. Johnson Company Catalog. RF Connectors Catalog 312 1986. Material: paper. Size: 8 1/2" x 11". Description: blue cover; color photograph of E.F. Johnson Company Products; E.F. Johnson logo bottom center; white print: "JCM (SMA, SMB, SMC, Types) RF Connectors, Catalog 312, Components Division"; 36 pages. Logo in use from 1986-1993.