| http://www.w3.org/ns/prov#value | - Patent US5047255 - Activating material composed mainly of animal bone, flocculating agent ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More ??Sign inAdvanced Patent SearchPatentsA first activating material with pores having alkali-ionization promoting function and a process for the preparation thereof, the material comprises animal bone material which is calcined so that th
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