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Manhole Covers. Ancient Roman made out of lime sandstone, 1st century AD,. Hamline Avenue 1915. Krakow, Poland 2012. Nashua, New Hampshire Old one on top of it replacment. Matsumoto, Japan. Prague. Germany. Manhole Covers. Why are they round?. - PowerPoint PPT Presentation
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Manhole Covers
Ancient Roman made out of lime sandstone, 1st century AD,
Hamline Avenue 1915
Krakow, Poland 2012
Nashua, New Hampshire Old one on top of it replacment
Matsumoto, Japan
Prague
Germany
Manhole Covers
Why are they round?
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