Gray Line Sight Seeing Co of Chicago, Ill, installed 20 prototype systems in fleet operation; no shielded cables, ignition suppressors, or shock mounts required; unit is hermetically sealed from damage from moisture and temperature; system carrying trade name "Mobilfone" functions without conventional vacuum tubes.
Public address system for buses
Bus Transportation
Bus Transportation ; 34 , n 2
1955
Article (Journal)
English
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