5 1/4" X 3 3/4" (133mm X 95mm)
No markings {Thomas}
Picture courtesy Elton Gish |
U-376B: USA
5 1/4" X 3 3/4" (133mm X 95mm)
No markings {Thomas}
Picture courtesy Elton Gish |
U number assignment by Jack Tod. 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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