Abstract: To form a fine slit having a width of 0.1 mm or less in each piece of a piece type tire mold, a plate-like shim member 44 having a width of 0.1 mm or less is inserted into a rubber mold 40A when a piece 40 is to be produced, a molten metal such as aluminum is injected into a plaster mold 40B to which the shim member 44 has been transferred and solidified to cast the piece 40, and the shim member 44 is removed from the piece 40 to which the shim member 44 has been transferred to form a slit having a width of 0.1 mm or less in the piece 40.

Abstract: To form a fine slit having a width of 0.1 mm or less in each piece of a piece type tire mold, a plate-like shim member 44 having a width of 0.1 mm or less is inserted into a rubber mold 40A when a piece 40 is to be produced, a molten metal such as aluminum is injected into a plaster mold 40B to which the shim member 44 has been transferred and solidified to cast the piece 40, and the shim member 44 is removed from the piece 40 to which the shim member 44 has been transferred to form a slit having a width of 0.1 mm or less in the piece 40.

Abstract: A charging apparatus capable of charging a secondary battery so that a utilization time thereof is not shortened is disclosed. When a microcomputer 63 judges that a voltage of the secondary battery has not reached a fully charged voltage, the microcomputer sets a predetermined value to a timer circuit 65 and then turns on a drive portion 57 to flow current through a resistor 59 so that the secondary battery is charged by a normal charging current. At the same time, the timer circuit 65 is started. When the timer circuit 65 reaches the set value, the microcomputer 63 turns off the drive portion 57 and turns on a drive portion 60 to thereby flow current through a resistor 62 so that the secondary battery is charged by a trickle charging current.

Abstract: A cordless telephone includes a portable telephone and a base station. The portable telephone includes a voltage drop detecting circuit for detecting that a battery for supplying power to the circuit within the portable telephone is dropped in voltage to a predetermined value or less, and a control unit for controlling a transmission unit so that it transmits a voltage drop signal in accordance with an output from the voltage drop detecting circuit. When the voltage drop detecting circut detects the voltage-dropped state of the battery, a signal indicative of such state is sent to the base station.