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EXTENSION RING FOR EVENING MANHOLES WITH ROAD SURFACE
EXTENSION RING FOR EVENING MANHOLES WITH ROAD SURFACE
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机译:带有路面的夜间人形延伸环
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摘要
The invention refers to an extension ring for evening manholes with road surface consisting of a cast-iron piece having 4, 6, or 8 threaded holes (depending on the form) destined to attach to the existing manhole base and whereon is placed the manhole cover.
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