E. F. Johnson Company Product. Inductor. Material: plastic, metal. Size: 3 3/4" diameter coil x 2 1/4" L. Description: black Bakelite,silver colored metal and copper - type 619 Inductor. "Hi-Q" or type "L" design. Museum label black on silver: "619 - 1928." Stamped in yellow on top frame edge: "623." Johnson decal on base. One base foot broken and missing.inches.