Assertion: pyrrhotite | /r/HasProperty | prepared in march 1961 of this journal
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Source sentences:
text: In the previous work on the magnetic separation of pyrrhotites prepared in March 1961 of this journal, it was discussed that there are two types of magnetic distribution curves in the powdered samples of pyrrhotites, that is, one is a strongly magnetic mono-peak type and the other is a weakly magnetic di-peak type.