5 3/8" X 4 1/4" (136mm X 108mm)
No markings {Thomas}
Picture courtesy Elton Gish |
U-376A: USA
5 3/8" X 4 1/4" (136mm X 108mm)
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.
Return to the National Insulator US Unipart page