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Variable message sign - A variable (also changeable, electronic, or dynamic) message sign, often abbreviated VMS or CMS, is an electronic traffic sign often used on roadways to give travelers information about special events. Such signs warn of traffic congestion, accidents, incidents, roadwork zones, or speed limits on a specific ...
Electronic speed control - An electronic speed control or ESC is a device mounted onboard an electrically-powered radio control model in order to vary its drive motor's speed, its direction and even to act as a dynamic brake in certain controllers. An ESC can be a ...
Belt sander - A belt sander is a machine used to quickly sand down wood and other materials for finishing purposes. It consists of a small motor that pulls a sandpaper belt along.
Variable speed of light - A variable speed of light (VSL) is the concept that the speed of light may not be constant over time. This has several implications for physics.
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