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| 082 | _a621.3821 HEL | ||
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_aHelvoort , Huub. Van _959169 |
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| 245 | _aNext generation sdh/sonet ,evolution or revolution | ||
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_aENGLAND _bJOHN WILEY _c2005 |
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| 300 | _aX,240P | ||
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_aSYNCHRONOUS DIGITAL HIERARCHY-DATA TRANSMISSION.SONET-DATA TRANSMISSION.SDH _959170 |
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