Portable, self-powered multiple warning device
作者： Thomas Vieweg
DOI:
关键词:
摘要: Portable, self-powered multiple warning device, including an alarm clock, a smoke or gas detector, common power source for powering the clock and first means issuing activation signal second detector.
lens.org 参考文章(1)
Hrand M. Muncheryan, Silent awakening system with means adapted to induce sleep ,(1977)