Abstract: A community dialing circuit apparatus for IP phone and POTS phone is provided. The apparatus includes an IP phone system, a POTS phone system, an insulation system connected between the IP phone system and the POTS system, and a keypad connected to the IP phone system and the POTS system for inputting the phone number. When the city power is on and a phone number having a format of the IP phone number is inputted, the POTS phone is disabled and the IP phone is activated. When the city power is on and a phone number having a first format of the POTS phone number is inputted, the POTS phone is activated and the IP phone is disabled. When the city power is off and a phone number having a second format of the POTS phone number is inputted, the IP phone is turned off and the POTS phone is activated.

Abstract: A community dialing circuit apparatus for IP phone and POTS phone is provided. The apparatus includes an IP phone system, a POTS phone system, an insulation system connected between the IP phone system and the POTS system, and a keypad connected to the IP phone system and the POTS system for inputting the phone number. When the city power is on and a phone number having a format of the IP phone number is inputted, the POTS phone is disabled and the IP phone is activated. When the city power is on and a phone number having a first format of the POTS phone number is inputted, the POTS phone is activated and the IP phone is disabled. When the city power is off and a phone number having a second format of the POTS phone number is inputted, the IP phone is turned off and the POTS phone is activated.

Abstract: Chemical compounds of the general formula 1

Abstract: A radiation fin set comprising a plurality of metallic radiation fins arranged in parallel for direct welding/bonding to a beat dissipation base panel or mounting on a heat dissipation tube at the heat dissipation base panel, the radiation fins each having a plurality of elongated slots and a plurality of flanges respectively extended along one side of each of the elongated slots and sloping in one direction at an angle of slope for guiding the flow of air of high momentum into mixing with the flow of air of low momentum to repress the formation of boundary layer and to improve heat dissipation efficiency of the radiation fins.

Abstract: A modular chair includes a seat unit, a back unit that is mounted removably on the seat unit, and two armrest units that are mounted respectively and removably on the left and right sides of the seat unit.

Abstract: A battery charging/discharging switching control protective circuit including a charging discharging loop, a constant current control circuit connected to the input terminal of the charging discharging loop, a microprocessor control circuit, a time series control circuit with its input terminal connected to the microprocessor control circuit and its output terminal connected to the switch of the charging discharging loop and the switches of the constant current control circuit, the time series control circuit being controlled by the microprocessor control circuit to control the transistor of the charging discharging loop in charging or discharging the battery at a constant current value, and to control the switches of the charging discharging loop in turning off the transistor at the beginning or the end of the charging or discharging operation, so as to prevent the occurrence of electric arc, sparks, transient electric current and voltage during the switching of the switches of the charging discharging loop.

Abstract: An electric heater circuit for an electric heater includes a set of heater coils for generating heat, a normally closed temperature sensitive switch for deactivating the heater coils when the temperature inside the electric heater exceeds a predetermined threshold temperature, a normally closed tilt sensitive switch for deactivating the heater coils in response to tilting movement of the electric heater beyond a predetermined amount relative to a normal upright position, a light and buzzer combination for providing signals when either the temperature sensitive switch is opened as a result of the temperature inside the electric heater exceeding the predetermined threshold temperature or the tilt sensitive switch is opened as a result of tilting movement of the heater beyond the predetermined amount relative to the normal upright position, fan and an adjustable thermostat.