Transferred from the Department of Commerce, Bureau of Standards
Date: ca. 1944
Country of Origin: United States of America
3-D Test: 20 x 19.7 x 2.5cm (7 7/8 x 7 3/4 x 1 in.)
Aluminum, Plastic, Adhesive
210mm long, 167mm high; Type D-2; 24 volts; c.1944; nickel plated.