AMRAD type D-1 medium wave coupler
Date: 1921
Inventory Number: RS0757
Classification: Coupler
Place of Origin:Medford Hillside, 57, MA, United States
Dimensions:box: 15 x 15 x 21 cm, 2 lb. (5 7/8 x 5 7/8 x 8 1/4 in., 0.9 kg)
Description:
AMRAD, (American Radio and Research Corp) Medford Hillside, 57, Mass. - New York District Office, 21 Park Row. Chicago District Office, 608 S. Dearborn St. (General Radio-Cruft)