. QST . >9 ^i|^3|. 50 KG. MARKERS FROM A 100 KG. GRYSTAL See pages 40 & 41 of July, 1954, Q%1. Each EL-100crystal must work perfectly In our frequency stand-ard (built just like the one in the C ^ ORarticle) before it is sold. EL-100 only ^ ^ ^^ $5 E. B. LEWIS CO. 11 BRAGG STREETEAST HARTFORD 8, CONNECTICUT

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Keywords: ., bookcentury1900, bookdecade1910, booksubjectradio, bookyear1915