Abstract: An anti-collision device in the form of a portable air bag which may be attached to the dashboard of any car. The air bag may be easily moved from car to car or left attached in a single car, adding the passenger side protection which was omitted by the manufacturer. The invention is independently powered, and requires no more effort to install than attaching the base to the vehicle dashboard, adjusting the angle, and turning the device on. If desired, the device can be attached to the dashboard with Velcro.RTM. fastening material or the like, allowing easy movement between multiple vehicles. The activating mechanism automatically adapts to any angle of dashboard, and automatically triggers the bag on impact without need for manual intervention. The activation mechanism is disarmed when the bag is turned off and/or removed from a dashboard, eliminating the danger of false triggering when it is not installed.

Abstract: A call tracing and identification system for use with a public telephone network includes at least one interrogation and digital display circuit associated with a called-party telephone of the network, and an encoder circuit associated with a calling party telephone in the system. In response to an interrogation command initiated by a ringing signal or a line voltage change when the telephone is answered, the encoder circuit generates a series of coded signals and applies the same to the telephone for identifying the calling party by area code and telephone number. The identification signals are received by the display circuit of the called telephone where they are rapidly decoded, stored and displayed in digital form. The number of cycles of transmitted sine wave frequency is used for identification, and an output of a sequentially addressed memory to a display is gated in synchronism with the addressing at a rate sufficient to be visually imperceptible.