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1. 40% SiO , by J. S. Machin and D. L. Hanna.
2. CaO-Al O -SiO , by J. S. Machin and Tin Boo Yee.
3. 35%, 45%, and 50% SiO , by J. S. Machin, Tin Boo Yee and D. L. Hanna.
4. 60 and 65% SiO , by J. S. Machin and Tin Boo Yee.

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