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| Number | Title | Issue Date |
| 4121102 | Object identification system A transponder/interrogator system for remotely identifying objects. The interrogator emits infrared pulses to activate and remotely clock the transponder. Upon such activation, the transponder emits a unique code in the form of infrared pulses in accordan... | 10/17/1978 |
| 4025791 | Object identification system A transponder/interrogator system for remotely identifying objects. The interrogator emits infrared pulses to activate and remotely clock the transponder. Upon such activation, the transponder emits in synchronism with the interrogator pulse a unique code... | 05/24/1977 |
