A pin, pendant or other charm for personal wear having a decorative cover providing a display or viewing zone where index markings, various color pieces, symbols, or other code identifying elements may be selectively exposed for accented observation. In embodiments of the invention one movable element having a plurality of distinct index units thereon is disposed behind the cover whereby only one or a limited number of index units is viewable at the viewing zone at any one time. A rotatable inde...

An electronic key comprises a first binary counter and a first multiplexer or pulse code modulating a uniform clock pulse train to produce a first coded pulse train modulated with a given code. The key is connected to an electronic lock comprising: a second binary counter and a second multiplexer for pulse code modulating the same clock pulse train to produce a second coded pulse train modulated with the same code; an EXCLUSIVE-OR gate to which said first and second multiplexers are connected; a...

The present invention pertains to a coded electronic security system which includes a plurality of independent transmitting devices, each of which transmits a radio frequency signal at the same frequency. Each transmitter includes a unique modulator which "keys" it at a frequency which corresponds solely to that particular transmitter. One or more remotely located receivers is adapted to receive and decode the signal generated by any of the transmitters and to indicate which of the transmitters ...

The disclosure relates to a manually operated recodable coded switch in which a code may be inserted, tried and used to actuate a lever controlling an external device. After attempting a code, the switch's code wheels must be returned to their zero positions before another try is made.

A coded switching device having a plurality of actuator dial knobs will, n set to a predetermined combination, provide electrical continuity between terminals on the device. Setting the dial knobs to another predetermined combination will enable the combination to be changed. The device consists of a number of stations, each comprising an actuator, a switch, and a detent mechanism, equal to the number of digits desired in the combination. Each switch is wired such that only one position will pro...

A radar fuzing system for a guided missile is shown to include means for impressing a polyphase coded modulation on a transmitted signal and delayed replicas of such modulation on a bank of correlator/mixers, each one of the latter including dual gate field effect transistors as the active elements.

A coded optical identification system includes a linear array of three-dimensional segments. A first plurality of the segments have planar surfaces thereon from reflecting light from a light source to a light sensor, and a second plurality of the segments have a sloping surface thereon for directing light from the light source away from the light sensor.

A subminiature rotary coded switch having a dual-in-line configuration. Flexible contacts making electrical connection with the dual-in-line terminals of the switch are mounted within a stationary body. A drum-shaped detenting cover has printed circuitry on its inner cylindrical surface, typically in the form of a flexible printed circuit board. The cover rotates the flexible board with respect to the body, producing a wiping action with respect to the flexible contacts, thereby producing the de...

A radar fuzing system for a guided missile is shown to include means for impressing a polyphase coded modulation on a transmitted signal and delayed replicas of such modulation on a bank of correlator/mixers, each one of the latter including dual gate field effect transistors as the active elements.

A counterbalance cylinder pressure control for a mechanical press which has a slide, a die punch mounted on the slide and a die shoe. A coded plug is attached to the die shoe and means are provided for reading the code on the plug which indicates the weight of the die punch associated with that die shoe. A voltage signal produced from the decoding of the plug is used in a servo system to control the air pressure in the counterbalance cylinders. When a new die set is placed in the mechanical pres...