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Air Entrainment was uncovered by chance in the mid-1930s.[2] At that time, cement manufacturers were being using a grinding aid to enhance the process of grinding cement. This grinding help was a mix of varied chemicals, together with salts of wood resin, which were additional for the cement through the https://3d-printer-price71481.angelinsblog.com/34478081/about-release-agent-spray
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