Class of service telephone system
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| creator | YUAN WILLIAM K. C PLATT ERIC G |
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| format | Patent |
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| language | eng |
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| subjects | BASIC ELECTRIC ELEMENTS BASIC ELECTRONIC CIRCUITRY ELECTRIC COMMUNICATION TECHNIQUE ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR ELECTRICITY PULSE TECHNIQUE SELECTING SEMICONDUCTOR DEVICES |
| title | Class of service telephone system |
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