共 50 条
- [31] PUSH-BUTTON DIAL KEY TELEPHONE SYSTEM JAPAN TELECOMMUNICATIONS REVIEW, 1970, 12 (02): : 140 - &
- [33] FREQUENCY-DIVISION MULTIPLEX KEY TELEPHONE SYSTEM IEEE TRANSACTIONS ON COMMUNICATION TECHNOLOGY, 1971, CO19 (06): : 1242 - &
- [34] INTEGRATED KEY TELEPHONE SYSTEM WITH DIGITAL BUS ARCHITECTURE REVIEW OF THE ELECTRICAL COMMUNICATIONS LABORATORIES, 1987, 35 (06): : 657 - 664
- [36] ELECTRONIC KEY TELEPHONE SYSTEM FOR SMALL OR MEDIUM OFFICES REVIEW OF THE ELECTRICAL COMMUNICATIONS LABORATORIES, 1983, 31 (04): : 516 - 523