+## sn 11255 - 11758 ##
+
+Production build of 504 pieces of TeleMetrum v4.0 by
+[Advanced Circuits](http://4pcb.com), received 2023.02.18 -
+
+## sn 11759 - 12046 ##
+
+Production build of 288 pieces of TeleGPS v3.0 by
+[Advanced Circuits](http://4pcb.com), received 2023.03.28 -
+
+## sn 12047 - 12396 ##
+
+Production build of 350 pieces of TeleBT v4.0c by
+[Advanced Circuits](http://4pcb.com), received 2023.04.03 -
+
+## sn 12397 - 12646 ##
+
+Production build of 250 pieces of TeleMini v3.0a by
+[Seeed Studio](https://seeedstudio.com), received 2023.06.12
+
+## sn 12647 - 12651 ##
+
+Prototype build of 5 pieces of EasyTimer v2p2 by Bdale on 2024.01.06
+
+## sn 12652 - 12653 ##
+
+Prototype build of 2 pieces of TeleLCO v3.0p1 by Bdale on 2024.01.07
+
+## sn 12654 - 12655 ##
+
+Prototype build of 2 pieces of EasyMega v3p1 by Bdale on 2024.02.02
+
+
+## sn 12656 - 12657 ##
+
+Prototype build of 2 pieces of TeleFireEight v2.1p1 by Bdale on 2024.02.18
+
+## sn 12658 - 12659 ##
+
+Prototype build of 2 pieces of EasyMega v3p2 by Bdale on 2024.03.02
+
+## sn 12660 - 13159 ##
+
+Production build of 500 pieces of EasyTimer v2 by
+[Seeed Studio](https://seeedstudio.com), received 2024.04.16
+
+## sn 13160 - 15159 ##
+
+Production build of 2000 pieces of EasyMini v2.1 by
+[Seeed Studio](https://seeedstudio.com), received 2024.05.03
+
+## sn 15160 ##
+
+Prototype build of 1 piece of TeleLCO v3.0p2 by Bdale on 2024.06.06
+
+## sn 15161-15210 ##
+
+Production build of 50 pieces of TeleFireEight v2.1 by
+[Seeed Studio](https://seeedstudio.com), received 2024.07.02
+
+## sn 15211-15460 ##
+
+Production build of 250 pieces of EasyMega v3 by
+[Seeed Studio](https://seeedstudio.com), received 2024.07.30
+
+## sn 15461-15462 ##
+
+Prototype build of 2 pieces of TeleGPS v4p1 by Bdale on 2024.08.13