| Class 4 Active RFID Multi-hop Relay System based on IEEE 802.15.4a Low-Rate UWB in Sensor Network Recent countries visiting this post |  |
 | 6 | United States |
 | 1 | Germany |
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| Class 4 Active RFID Multi-hop Relay System based on IEEE 802.15.4a Low-Rate UWB in Sensor Network Recent countries visiting this post | |
| 6 | United States |
| 1 | Germany |
| 1 | Ukraine |