E. F. Johnson Company Product. Paging System. Material: plastic, paper. Size: 2" x 2" photo transparency mounted in cardboard frame. Description: color photo of an E.F. Johnson Company Products Paging System; lower left hand corner is the Johnson FM Paging Base; lower right hand corner is the Johnson Code Central Paging System; front center is the Johnson Coder 12 FM Paging System; back right is the Johnson Desk Microphone (Mic, Mike).