Abstract: In a mobile telephone system of the type in which the service area of the system is divided into a plurality of radio zones, mobile-system base stations are installed in respective radio zones, each mobile-system base station is connected to a mobile-system control unit through a common control channel and a plurality of speech channels, and the mobile-system control unit is connected to an existing telephone network via a mobile-system exchange unit, there are provided signal lines extending between the mobile-system base stations and the mobile-system control unit and between the mobile-system control unit and the mobile-system exchange unit and respectively combined with each of the speech channels. These signal lines are used to determine the state of the speech channels, and to transmit control and information signals.

Abstract: A method for manufacturing a base of a pressure mount type semiconductor device which has a base body of electrically and thermally conductive metal material and a cylindrical wall integrally and vertically provided on the top of the base body and adapted to engage a pellet pressurizing member so that the pellet pressurizing member is restrained from its upward movement, the base body being integrally provided with an annular projection of weldable material which is used to projection weld to the base on the upper surface, a shell to cover a semiconductor pellet on the base and with a stud to be threaded later.

Abstract: At the point of time to when the turbine speed has come up to a first speed N.sub.1, a thermal stress expected in the turbine when the speed is increased to a second speed N.sub.2 at a rate .alpha..sub.1 is presumed. Thermal stress .sigma..sub.s(t) -.sigma..sub.sT1 at the point of time t.sub.o1 for commencing acceleration to the second speed N.sub.2 is then obtained, which point of time t.sub.o1 would never cause the maximum value of the presumed thermal stress to exceed a predetermined limit .sigma..sub.sl of the thermal stress when the turbine speed is increased at that rate. Then, a length of time T.sub.w1, referred to as a warming time, is determined which is required for the thermal stress .sigma..sub.s(t) to decrease to the level of (.sigma..sub.s(t) -.sigma..sub.sT1) when the warming is continued after the point of time t.sub.o. Subsequently, a length of time (N.sub.2 -N.sub.1)/.alpha..sub.1 required for increasing the turbine speed from N.sub.1 to N.sub.2 at the rate .alpha..sub.1 is calculated.

Abstract: A clock regenerator for a binary input which comprises a shift register having successively coupled first stages, a single predetermined stage, and second stages. A frequency divider device responsive to a local oscillation and with a controllable ratio produces timing pulses of a timing period equal to that prescribed number of clock periods which may be unity. Each timing pulse presets a binary signal in the single predetermined stage. The signal is shifted, when a transition occurs in binary values of the input signal within a predetermined interval defined by each timing period. The signal is shifted into the first and second stages if the transition occurs during a leading and a trailing half of each timing period, respectively, the timing pulse thus leading and lagging behind the input signal. The shifted binary signal controls the frequency division ratio to phase-synchronize the timing pulses with the input signal.