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In most places, you can see only one of the pair of insulator
manholes, just as you can usually see only the conduit and the rail
closer to the center of the street. I think they may have scraped the
street down a little more near the center mall curb.
Here are two places where the pair of manholes are at least
partially exposed, photographed on different days under very different
lighting conditions. In the lower photo, you can see where the
conduit has been broken off by some later streetwork that is not at
all evident now.
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