PROFESSIONAL SHARPENING PRODUCTS
United States Patent 4389223 ... mixing the resulting powder with single-crystal CBN particles having a maximum dimension ranging from 5 to 150 microns and in a concentration of 5-30 volume percent single-crystal CBN; (c) prepressing the mixture from part (b) in a hand press at about 20,000 psi (137.9 kPa); ... (63/53 micron) catalyst grown CBN ...
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