According to one embodiment, a power transistor package includes an electrically conductive flange configured to be connected to a source of a power transistor device. This server system integrates the collection of a payment via the network and the automatic distribution of the product with the calculation of commissions using a multi-level marketing commission structure and the distribution of commissions and fees via the network. At least one dummy electrode is arranged external to the effective electron emission area. The slide is movably supported on the first case member. A first averaging switch is connected between a first node and second node.