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 -
+