PAT'D BY F.M. LOCKE VICTOR N.Y. // MARCH 31, 1914, FEB 2, 1915, OCT 12, 1915
Picture Courtesy John & Carol McDougald
CD 247.3: USA
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Picture Courtesy John & Carol McDougald |
This rare high voltage insulator is was made for Fred M. Locke to his patents for boro-silicate glass that are similar to the Corning Pyrex formulas.
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