Braking devices and signal devices necessary for operations shall be provided.

二应备有掣动装置及操作上所必要之信号装置。

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The application of this system improves evidently the reliability and safety of the signal devices. Meanw...

该系统的应用，显著提高了信号设备的安全可靠性，改善和优化了现场维修。

youdao

The application of this system improves evidently the reliability and safety of the signal devices. Meanwhile it is benefit to th…

该系统的应用，显著提高了信号设备的安全可靠性，改善和优化了现场维修。

youdao

Meanwhile mixed signal devices proliferate with both analog and digital components on a single chip.

FORBES: Magazine Article

For such wireless networks, Google has publicly supported the possibility of using small, inexpensive cellular devices, called "micro cells" that would be located at the access points and would harness the TV airwaves to broadcast the equivalent of a 3G or 4G wireless signal for devices within a quarter-mile radius.

WSJ: Google to Fund, Develop Wireless Networks in Emerging Markets

The devices also can signal whether a trailer is full, is connected to a truck and has open doors.

FORBES: Iridium for truck trailers