the popular types for manhole cover
Here popular design types for manhole cover
1 Hinged round manhole cover
(circular cover+circular frame) ex:hinged D400 600mm
(recessed concrete cover and frame) ex:israel concrete cover
(Settlement-proof manhole cover) ex:190mm height manhole
2 Square manhole cover
( rectangle cover+rectangle frame) ex:telecom manhole cover
(round cover+square frame) ex:850*850 D400 600mm
(triangle cover+square frame） ex:telecom manhole cover CO1500*750mm
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