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Subclass TN
| TN1-997 | Mining engineering. Metallurgy | |
| TN263-271 | Mineral deposits. Metallic ore deposits. Prospecting | |
| TN275-325 | Practical mining operations. Safety measures | |
| TN331-347 | Mine transportation, haulage and hoisting. Mining machinery | |
| TN400-580 | Ore deposits and mining of particular metals | |
| TN600-799 | Metallurgy | |
| TN799.5-948 | Nonmetallic minerals | |
| TN950-997 | Building and ornamental stones | |
