An improved bag clamp comprises a first jaw member and a second jaw member. The valve body separates an explosive charge at the shell side from an impact-sensitive firing charge. When the five terminals are connected to the touch panel, the detecting unit provides a high potential and a low potential to first and last of the five terminals, respectively, thereby determining whether the touch panel is a 4- or 5-terminal resistive touch panel by determining if there is a closed circuit between the two terminals. Unique candidate spines including clusters sharing at least one common theme are logically formed.