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The hidden guard / Manhole cover

The hidden guard
The hidden guard

Design instruction:
Warning mark ruler: when the heavy rain,the water reaches a certain degree,is beyond the buoyancy, concealed in the manhole cover of warning feet will float out ,which makes people quickly find manhole covers, Put the lid on crossing beside the water can play a warning role, also can measure the depth of the water.


Guangdong Industry Technical College

Guangdong Industry Technical College
Guangzhou, China