1. But to be sure, I have to study the main switch box in each casino

2. In this switch box topology, a wire in track number one connects only to wires in track number one in adjacent channel segments, wires in track number 2 connect only to other wires in track number 2 and so on.

3. The alarm device (4) comprises a float tank (5), a float (6), a first guide rod (7), a movable contact (8), a stationary contact (9), a switch box (10), a controller (11), a loudspeaker (12), and a warning lamp (13).