PYREX T.M. REG.U.S.PAT.OFF. // MADE IN U.S.A. 63
Picture Courtesy Bob Berry
CD 234: USA
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Picture Courtesy Bob Berry |
This low voltage style was made by Corning Glass (Pyrex) and is found in both clear and carnival glass. The carnival coating was most likely used as a marker for high voltage on the same pole as communication circuits.
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