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Carborundum Co |
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1939-11-27 |
1941-09-01 |
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1941-06-09 |
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Improved manufacture of abrasive coated sheet materials
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1958-05-01 |
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Abrasive grain
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1967-10-12 |
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Vacuum screen printing method
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Ducommun Inc |
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1970-09-22 |
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Norton Co |
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1975-10-20 |
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Minnesota Mining And Manufacturing Company |
Non-fused aluminum oxide-based abrasive mineral
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1984-07-20 |
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1987-02-26 |
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Molding shaped articles
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2006-09-01 |
한국화학연구원 |
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2007-01-25 |
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*
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2009-07-07 |
3M Innovative Properties Company |
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2008-03-04 |
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2008-05-20 |
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2008-10-02 |
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2007-01-23 |
2015-10-28 |
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2020-09-23 |
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2012-03-27 |
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Dish-shaped abrasive particles with a recessed surface
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2008-12-17 |
2012-03-27 |
3M Innovative Properties Company |
Shaped abrasive particles with a sloping sidewall
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