PITTSBURGH, Nov. 25, 2025 /PRNewswire/ -- "I thought there should be a way to create a flush pavement surface over recessed manhole covers on roadways," said an inventor, from Mount Royal, QC, Canada, ...
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A manhole cover may have been the first object launched into space
Manhole covers are round for a mix of safety, engineering, and practical reasons. A circular cover can't fall through its ...
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