At the object level . Permissions allowed or denied at the object level apply to the entire object. For example, you can set an object-level permission on an OU object that allows a particular group, such as Account Operators, to create child objects in the OU. At the property level .
Ball mills are used in chemistry and in industry to grind hard solids to a very fine powder. They are very similar to rock tumblers. Basically, the idea is to rotate a container filled with heavy metal balls that crush the substance that you want to grind.
Coffee grinder, a machine used for grinding coffee. Herb grinder, a grinder used for herbs including marijuana. Meat grinder, a machine used for grinding food. Wet grinder, a grinder that uses water either to soften the product ground or to keep the grinding elements cool. Grinder winch, a device for tensioning a rope to control a sail on a boat.