A spray gun suitable for electrostatic coating, using a coating material whose electric resistance is relatively low. The powered stapler includes a main frame member adapted to carry a strip of staples. The security monitoring system comprises the following: a cable; a central control unit connected at the first end of the cable, capable of issuing a first signal; at least one addressable video camera connected at the second end of the cable connected to the central control unit; and a monitoring device for displaying a second signal. The ambulation assist apparatus may comprise a rigid structure configured to provide support between a portion of the patient’s body and a surface. The radio frequency identification component also includes one, or more antenna for reading the information from the radio-frequency identification labels oh each container. The cartridge that is inserted in the case is attracted by a magnet mounted on the vertically movable table and having stronger magnetic forces than the magnet, and is released from the magnetic attraction by the magnet and loaded into the case.