The first match was accidentally discovered in 1826 when John Walker scraped a stick with chemicals on the end against a stone floor.
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| Number | Title | Issue Date |
| 7109845 | Circuit arrangement for signal detection having current mirror with cascode coupled transistors A circuit arrangement for detecting a received signal includes a rectifier with an input connected to a receiving antenna for rectifying an encoded received signal, a signal capacitor connected to an output of the rectifier, a discharge current sink connected to the... | 09/19/2006 |
| 7106173 | Tags, wireless communication systems, tag communication methods, and wireless communications methods Tags, wireless communication systems, tag communication methods, and wireless communications methods are described. In one aspect, a tag includes a plurality of antennas configured to receive a plurality of first wireless communication signals comprising data from a... | 09/12/2006 |
| 4494115 | Controller for a locked carrier distributed multiplexed telemetry system A controller for a locked carrier distributed multiplexed telemetry system hich uses on-off switching of a d.c. power supply and a pilot signal generator at a remote control unit. A pilot signal from the remote control unit is amplified and rectified. The ... | 01/15/1985 |
| 4384314 | Control system for plural transformer relays A control system adapted to control a plurality of transformer relays. An electrical isolation network is coupled to each of a plurality of transformer relays, having a pair of common control lines and providing electrical isolation for each of the plural... | 05/17/1983 |
| 3999126 | Test device for simultaneously displaying the level of logic signals in a plurality of circuits A test clip suitable for connection to a plurality of terminals at which appear respective logic signals representing those occurring in logic circuits provides an indication of the logic level of such signals. The circuit for effecting such indication is... | 12/21/1976 |
| 3979744 | Circuit arrangement for the digital control of operating functions via sensor electrodes, especially in radio and television receivers The invention provides for the digital control of the operating functions in a radio or T.V. receiver using sensor electrodes in place of mechanical control devices. A sensor control panel is provided for directly setting an electronic stepping circuit to... | 09/07/1976 |