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| 公开/私有: | 公开 私有 |
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- congresses (14)
- telecommunication (11)
- telephone systems (4)
- history (3)
- social aspects (2)
- telephone (2)
- 儿童读物 (2)
- 电话 (2)
- cellular telephones (1)
- computer networks (1)
- data transmission systems (1)
- deutsche telekom (1)
- digital techniques (1)
- digital telephone systems (1)
- direct selling (1)
- economic aspects (1)
- electronic noise (1)
- emergency communication systems (1)
- emergency reporting systems (1)
- handbooks, manuals, etc (1)
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