Selective calling system
作者： Herbert C Waterman , Marion R Winkler
DOI:
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摘要:
lens.org 参考文章(3)
Chauveau Louis Lucien Eugene, Distant control device for use over telephone lines ,(1925)
Roy J Wensley, Televox controller and supervisor ,(1927)
Alexis A Lundstrom, Telephone substation circuit ,(1939)