Abstract: A decade digital telephone dial which is controlled by means of a keyboard is positioned in place of a conventional rotary dial in a standard telephone unit. An electronic circuit is provided for converting the information keyed into the telephone unit by the keyboard to signals for transmittal from the telephone unit to a called party and for storing as well as displaying telephone numbers keyed into the keyboard unit. The circuitry includes a power supply for converting telephone line current to AC and DC voltages useful in operating the telephone unit. A control circuit controls the transmission of line pulses as well as the storing of information for later use if it is desired that the telephone number be retransmitted in coded form without rekeying or dialing the telephone number. A display is provided for displaying the telephone number called to insure the accuracy of the number and to decrease the time involved in placing telephone calls.

Abstract: An electromechanical speed variator for apparatus having a device suitable to be rotated at two or more speeds different from one another, comprising a first electric drive motor for directly rotating said device at a first speed; a second electric drive motor for indirectly rotating said device at a second speed; a drive wheel connected to the shaft of one of said motors and a friction wheel idly rotably carried by a moving support between a first inoperative position remote from said drive wheel and a second operative position, thereat contacting said drive wheel and respectively the shaft of said other electric drive motor; and control means comprising an electromagnet, and return spring means acting on the moving support of the friction wheel to move the latter to either of its two said positions.