| 1. | Telephone system - nortel telephone system overview
电话系统- nortel电话系统总览 |
| 2. | Telephone system - iwatsu telephone system overview
电话系统- iwatsu电话系统总览 |
| 3. | Telephone system - toshiba telephone system overview
电话系统- toshiba电话系统总览 |
| 4. | Telephone system - nitsuko telephone system overview
电话系统- nitsuko电话系统总览 |
| 5. | Telephone system - at t telephone system overview
电话系统- at t电话系统总览 |
| 6. | Telephone system - panasonic telephone system overview
电话系统- panasonic电话系统总览 |
| 7. | Telephone system - nec telephone system overview
电话系统- nec电话系统总览 |
| 8. | Education system overview , list of universities and educational links
-综合性教育网站，同时为提供信箱服务。 |
| 9. | Home and building electronic systems - system overview - architecture
家用和建筑物用电子系统.系统概述.建筑结构 |
| 10. | Common type system overview
>通用类型系统概述 |
