US Patent Class 178
TELEGRAPHY-- Main Headings
 Electronic File Wrappers |  Electronic Patent Documents |  Paper Patent Documents | Current as of: June, 1999
|  and Services |
| Electronic File Wrappers | Electronic Patent Documents | Paper Patent Documents | Current as of: June, 1999
| and Services |
| CLASS NOTES | ||
| 1 | DF | MISCELLANEOUS |
| 2 R | DF | SYSTEMS {21} |
| 70 R | DF | REPEATERS {16} |
| 74 | DF | CIRCUITS {2} |
| 77 | DF | COMBINED INSTRUMENTS {1} |
| 79 | DF | CODE TRANSMITTERS {5} |
| 118 | DF | RECEIVERS {4} |
| 101 | DF | KEYS {9} |
| 111 | DF | TAPES {1} |
| 114 | DF | INSTRUMENT TABLES |
| 115 | DF | LEARNERS' INSTRUMENTS |
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| FOREIGN ART COLLECTIONS | ||
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| 2.0R | DF | SYSTEMS {2} |