Marked: "DAYRAD Tube Checker / Mfd. by the Radio Products Co., Dayton, Ohio. / Licensed Under Weston Patent 1704566 Type B". Includes leather carrying strap. Tube tester designed for A.C. plug in ...
Marked: "Sterling Type R-511 / Tester for AC & DC Tubes / & DC tube reactivator. / A.C. Volts 115 Cycles 50 / Serial No. ____ / The Sterling Mfg. Co., Cleveland, Ohio ...
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