This equipment should be controlled by well-qualified employees who are familiar with the sim box fraud detection rules and know how to use the devices properly to avoid dangerous. (underground drilling)Underground, in the coalmine, generally there are some tools which help miners to output the coal. They are: longwall shearer, boom-type roadheader and coal crusher. The first device is called longwall shearer. It is a mining tool, which works underground, in the so-called exploration wall, or in the place where the coal is straight output. It moves making use of the unique conveyor (known as scrapers); it does not use caterpillars (such as boom-type roadheader). The CM operator works such a machine by the remote control. (roof bolter)The second equipment applied underground is known as boom-type roadheader. It moves making use of caterpillars and works underground where drills roadways in the mine. Its front side with the tool drills the stone and move forward. The acquired coal is transferred at the bottom of the boom-type roadheader.The last machine, which will be presented in that article, is called coal crusher. It is a device used for crushing coals into smaller parts. There are devices for crushing mineral coal and brown coal, too.