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| 005 | 20251208144841.0 | ||
| 008 | 250729s1970 xx 000 0 und d | ||
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| 041 | _aeng | ||
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_aBiswas N N _9226128 |
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| 245 | _aPrinciples of telephony | ||
| 260 |
_aBangalore _c1970 |
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| 300 | _a130p | ||
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_aPhysics _9226129 |
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| 700 |
_aRao Digumurthi _9226130 |
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| 999 |
_c237190 _d237190 |
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