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_aTK6397 _bT465T |
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| 100 | 1 |
_aThompson, Richard A. _923244 |
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| 245 | 1 | 0 | _aTelephone switching systems |
| 260 |
_aBoston, Mass. : _bArtech House, _c2000 |
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| 300 | _a859 | ||
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_aTELEPHONE SWITCHING SYSTEMS, ELECTRONIC _923245 |
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_b01 _cคอมพิวเตอร์ |
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