The tool used to drive a slotted screw head is called a "standard", "common blade", "flat-blade", "slot-head", "straight", "flat", "flat-tip", or ""flat-head"" screwdriver. This last usage can be confusing, because the term "flat-head" also describes a screw with a flat top, designed to install in a countersunk hole. Furthermore, the term implies that a screwdriver has a "head"; it does not. Such a flat-headed screw may have a slotted, cross, square recessed, or combination head. Before the development of the newer bit types, the flat-blade was called the "Common-Blade", because it was the most common one. Depending on the application, the name of this screwdriver may differ. Within the automotive/heavy electric industries, it is known as a "flat head screwdriver"; within the avionics and mining industries, it is known as a "standard screwdriver". Though there are many names, the original device from 1908 was known as a "flat-head screw turner".