5" X 4 1/2" (127mm X 115mm)
No markings {Thomas}
Picture courtesy Bob Berry |
U-376C: USA
5" X 4 1/2" (127mm X 115mm)
No markings {Thomas}
Picture courtesy Bob Berry |
U number assignment by Elton Gish. Note this insulator was made to the Etheridge patent and has a unique pinhole to lock to a mount. US patent 676,881 on May 9, 1901.
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