. The Bell System technical journal . Fig. 13 — Sulfiding of Poly(Viu3l Cliloricle) plastic test rod beneath black, circular border and center area represent sulfiding at points of excep-tionally close contHct. Original magnification 2X. Photo bj^ J. B. DeCoste. 1122 THE BELL SYSTEM TECHNICAL JOURNAL, SEPTEMBER 1957.

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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1