B - Operations – Transporting – 28 – B
Patent
B - Operations, Transporting
28
B
22/108, 6/46
B28B 7/34 (2006.01) B22C 1/00 (2006.01)
Patent
CA 1080405
INVESTMENT MATERIAL Abstract of the Disclosure In the manufacture of non-ferrous investment cast- ing molds, a new investment material composed of a gypsum binder and a refractory which is at least in part pyrophyllite.
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