The present invention provides a heat-resistant and low-electric-resistance aluminum alloy thin film which, even after heat treatment at 300-400 C. The first power supply has a first controller with a first communication port and a first IO port and has a normal mode, a master mode and a slave mode. Base stations are used by mobile devices to attach to the wired portion of a packet-based network, such as the Internet, and exchange packets thereover with a correspondent node. A pivotable latch in the cavity includes a latch cam portion and a latch hook. The interface between the retaining surface and the track further prevents the top half from being lifted upward away from the male end. One or both of the roll stands are hanging.