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.
1 Blade grinder, includes food processors, blenders, electric coffee and spice grinders, etc. 2  Grinding (abrasive cutting), an abrasive machining process that uses a grinding wheel as the cutting tool.  Grinding machine, used in a machining operation to refine the surface of materials.