M-4800 Thomas and M-3990 Thomas

By Michael Spadafora; posted May 8, 2022

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Two of the largest classic first generation lilyshell insulators known to exist. The M-4800 has an 18" top skirt and the M-3990 has a 17" top This unit is more then 22" tall. These insulators were both produced in the 1906-1908 era. The CD 259 cable is added here for size comparison!

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