Highly directional tunnel broadcast for expressway tunnel

The utility model discloses a highly directional tunnel broadcast for an expressway tunnel, and relates to the technical field of broadcast devices. The device comprises a bottom plate and a fixing plate, the fixing plate is fixedly connected to the front side face of the bottom plate, a fixing devi...

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Bibliographische Detailangaben
Hauptverfasser:	YANG XINYU, ZHANG JIANHUI, ZHANG WEIMIN, KO JANG-HO
Format:	Patent
Sprache:	chi ; eng
Schlagworte:	ADVERTISING BLASTING CLEANING CLEANING IN GENERAL CRYPTOGRAPHY DISPLAY DISPLAYING EDUCATION ENGINEERING ELEMENTS AND UNITS FRAMES, CASINGS, OR BEDS OF ENGINES OR OTHER MACHINES ORAPPARATUS NOT SPECIFIC TO AN ENGINE, MACHINE, OR APPARATUSPROVIDED FOR ELSEWHERE GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS HEATING LABELS OR NAME-PLATES LIGHTING MECHANICAL ENGINEERING PERFORMING OPERATIONS PHYSICS PREVENTION OF FOULING IN GENERAL SEALS SIGNS STANDS OR SUPPORTS THERMAL INSULATION IN GENERAL TRANSPORTING WEAPONS
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