A constant-temperature type crystal oscillator includes: a crystal unit including a case main body including a first power source terminal on an outer bottom surface thereof; a surface-mounted oscillator; a temperature control circuit including a heating resistor and a temperature sensor; and a circuit substrate including a second power source terminal. The device comprises a support device having the support parts in contact with the substrates and a body part supporting the support parts. The second chip enable signal transfer unit buffers third and fourth chip enable signals according to the control signal. The computer operates to acquire a network flow record for the network flow through the network device. Although the magnitude of a capacitive coupling is determined by the length of the capacitor plates parallel to current carrying traces, the approach allows capacitive and inductive coupling to be balanced independently.