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- [2] New Alarm-clock Equipment WA 490. Technische Mitteilungen PTT (Post-, Telefon- und Telegrafenbetrieben), 1985, 63 (05): : 193 - 194
- [3] SUICIDE BY MEANS OF ELECTRICAL ALARM-CLOCK USED AS TIME-ELECTROCUTION WEAPON KRIMINALISTIK, 1977, 31 (10): : 446 - 448