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Porcelain insulators took over from glass insulators later in the 20th century, but manufacturers produced them in a variety of colors to try to duplicate the look of traditional colored glass insulators. The colors were used for color coding, to distinguish different types of wires on the pole.
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Knox pocelain pin type insulator
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by hm2169 on Feb. 8, 2012
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I got interested in insulators when I lived in El Cajon and my neighbor worked for San Diego Gas and Electric. His son had a bunch… [more]
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