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This rare style is essentially a CD 131.4 without threads. Three of these insulators were found on a house in Cincinnati in 1993. It is believed to have been the house of George Floyd. Floyd applied for a patent for a special pin that would "spring out" up inside a threadless insulator with an extra cavity in the dome area (see patent). For more information, read this article.
Primary Embossing:
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PATENT - DEC. 19, 1871
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Dates Produced:
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c.1871 |
| Style Number: | 1 |
| Usage:
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Telegraph
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