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Concrete paving stone is composed of upper and lower layers formed from hardened liquid concrete
Concrete paving stone is composed of upper and lower layers formed from hardened liquid concrete
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机译:混凝土铺路石由硬化液态混凝土制成的上下两层组成
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摘要
The concrete paving stone is composed of upper (3) and lower (4) concrete layers. The two layers are formed from hardened liquid concrete (6,7). An Independent claim is included fro a method of making the paving stone.
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