. QST . !Sgi|« 50 KC. MARKERS FROM A 100 KC. CRYSTAL See pages 40 & 41 of July, 1954, QST. Each EL-100crystal must work perfectly In our frequency stand-ard (built just like the one in the <r ^ Q^article) before it is sold. EL-100 only ^ ^ •^* 55 E. B. LEWIS CO, 11 BRAGG STREETEAST HARTFORD 8, CONNECTICUT 139

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Keywords: ., bookcentury1900, bookdecade1910, booksubjectradio, bookyear1915