US Patent Class 299
MINING OR IN SITU DISINTEGRATION OF HARD MATERIAL-- Main Headings




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Current as of: June, 1999
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CLASS NOTES
1.05  DF  AUTOMATIC CONTROL; SIGNALING OR INDICATING {4}
2  DF  TUNNEL RECOVERY OF FLUID MATERIAL
3  DF  IN SITU CONVERSION OF SOLID TO FLUID {3}
7  DF  WITH SEPARATION OF MATERIALS {2}
10  DF  PROCESSES {7}
19  DF  MINE LAYOUTS
20  DF  EXPANSIBLE BREAKING-DOWN DEVICES {2}
24  DF  ICE-WORKING DEVICES {1}
29  DF  HARD MATERIAL DISINTEGRATING MACHINES {17}
79.1  DF  CUTTER TOOTH OR TOOTH HEAD {17}
95  DF  MISCELLANEOUS