A device that automatically switches an electric lamp off and on, as in a commercial display sign.
A device that automatically switches an electric lamp off and on, as in a commercial display sign.
闪光装置如广告宣传告示上的一种自动点燃或熄灭电灯的装置
A device that automatically switches an electric lamp off and on, as in a commercial display sign.
闪光装置如广告宣传告示上的一种自动点燃或熄灭电灯的装置