URL details: www.wastewaterhero.com/mystery-of-the-manhole-cover/#respond
URL title:
The Mystery of the round manhole cover - Why is it round?
URL description:
The history of the manhole cover goes back thousands of years. Even the old Romans used stone covers for their sewers. The classic round design has been established since the 1870s and since then not much has changed in the appearance of the typical manhole cover. And why are manhole covers mostly round? As in many
URL keywords:
manhole cover, sewer cover
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2024-07-25
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