E. F. Johnson Company Catalog. Variable Condensers Catalog No. 701. Material: paper. Size: 8 1/2" x 11". Description: red cover; black and white sketch of an E.F. Johnson Company Condenser; E.F. Johnson logo center; white and black print: "Catalog No. 701, Variable Condensers, by Johnson"; 6 pages. Logo in use from 1938-1956.