CD 61

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http://www.peninsulators.org/Battery/ - Robertson patent

http://www.nia.org/timeline/1870.htm : "July 12, 1870: Orris W. Robertson of Milwaukee, WI patent for a battery rest insulator. This was probably the first battery rest style and is similar to CD 61 which had previously been classified as a threadless insulator. (US Patent 105,252)"

 

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