Marked: "E.I. Co. N.Y. / Pat.Appl.For". An electrolytic detector for receiving radio signals. EI catalog number 9002. A plastic base with metal bracket that supports the adjustable element. Two ...
Marked: "E.I. Co. / N.Y." Contacts labeled "+" and "-". White soapstone(?) base with plastic stand holding a metal arm and upper contact. Lower contact disc and two binding posts mounted on base. A ...
Some results have been hidden because they may be inaccessible to you
Show inaccessible results