Society of Glass Technology · [Sheffield] · leaf 661
etus to the blades immediatelythey have cut the glass, whereby they are instantly withdrawnand chilling by the shears is avoided. H. G. C. 289. The Manufacture of Sparking-plugs. R. Haddan,London, and the Corning Glass Works, Corning, New York,U.S.A. (Brit. Pat., No. 196721, February 7th, 1922).—A…
Glass
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