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Method of production of cast concrete tunnel sections involves forming semi-circular tunnel sections from blanks forming channel section
Method of production of cast concrete tunnel sections involves forming semi-circular tunnel sections from blanks forming channel section
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机译:生产浇铸混凝土隧道断面的方法包括由坯料形成半圆形隧道断面,形成通道断面
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摘要
The method of producing cast concrete tunnel sections uses a channel section which is covered with stone sections each formed from a blank with a semi-circular cross section to form a semi-toroidal shape which is sectioned along its middle axis. Claims include a blank and tunnel section
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