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_bF2.19 _aD66m73:N22 |
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| 245 | _aBell system technical Jr. vol.19... 1940 | ||
| 260 |
_c1926 _bAme.Telephone & Telegraphic Co. _aNew York |
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| 365 | _cRs. | ||
| 650 | _aD66m73:N22 | ||
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