Schematic of Telefunkon D detector receiver 1915

•      Dimensions of the plan approximately 50 x 35 cm
•      3x folded
•      Audion receiver Telefunkon "D" principle scheme / operating circuit
•      A REAL rarity
•      From the period between 1915-1923

In very good used condition, slightly stained and age-toned, very decorative wall decoration or simply to reverse engineering, you will see at the pictures.