Insulators Home > Insulator Styles > Glass > Threadless > CD 701.1
David Whitten's Glass Factories site references Ray Klingensmith as saying in the McDougalds' history books that Boston & Sandwich Glass Company "is believed to have manufactured some insulators in the 1850s-1860s period, including CD 701.1 threadless types".
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Insulators Home > Insulator Styles > Glass > Threadless > CD 701.1
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