Huge fog Bowl Insulator U number?

By Richard Case; posted September 15, 2015

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Huge fog Bowl Insulator U number? Any pictures in service, values? These were used in Dixon Illinois area cement plant along Route 2 as it came into the city.

I thought the insulator used "U" number and it already had the style number on it, A "M" number, M-3900. Thanks to all who wrote. In service photo... [id=1457109]

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