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Porcelain Fireplug Insulators |
These unusual porcelain insulators are nicknamed for their unusual shape that resembles a fire hydrant. These were patented in 1910 by Albert Stadermann, and can be found in several variations. Two examples are shown below along with the patent image.
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Here is the more common style marked UNIVERSAL |
Here is a larger style with double grooves on each arm marked with the patent date. |
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