| 501 / | HD | COMPOSITIONS: CERAMIC |
| 1 | DF | CERAMIC COMPOSITIONS {15} |
| 94 | DF | .~ Refractory {8} |
| 108 | | .~.~ Magnesium compound containing {7} |
| 109 | DF | .~.~.~> With organic material in starting mixture {1} |
| 111 | DF | .~.~.~> And phosphorus compound |
| 112 | DF | .~.~.~> And iron compound {2} |
| 117 | DF | .~.~.~> And chromium compound |
| 118 | DF | .~.~.~> And aluminum compound {1} |
| 121 | DF | .~.~.~> Less than 90 percent by weight magnesium compound |
| 122 | DF | .~.~.~> And silicon compound |