PYREX T.M. REG. U.S. PAT. OFF MADE IN U.S.A. 553
Picture Courtesy Bob Berry
CD 328.2: USA
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Picture Courtesy Bob Berry |
This high voltage insulator was made by the Corning Glass Works of Pyrex glass. It is numbered 553 indicating a 55KV rating. These were made both in clear glass and with carnival coating. The carnival coating is intended to reduce AM radio noise by providing a slightly conductive surface to eliminate corona.
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