Glass insulators were first produced in the 1850's for use with telegraph lines. As technology developed insulators were needed for telephone lines, electric power lines, and other applications. In the mid 1960's a few people began collecting these antique glass insulators. Today there are over 3,000 insulator collectors. Insulator clubs, local and national shows, and good reference books are available.

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Patent of the Day Design Patent 49,204 on June 20, 1916 By Jerome G. Cline Misc: Square insulator with larger square flange on top and threaded opening in top for bolt

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