Today there are approximately 20 types in common use around the world (see AC power plugs and sockets), and many obsolete socket types are still found in older buildings.
Today there are approximately 20 types in common use around the world (see AC power plugs and sockets), and many obsolete socket types are still found in older buildings. (en)
Today there are approximately 20 types in common use around the world (see AC power plugs and sockets), and many obsolete socket types are still found in older buildings. (en)