Prototype build of 3 pieces of TeleBT v4.0 beta 1 by Bdale on 2017.04.25.
+## sn 3689-3938 ##
+
+Production run of 250 pieces of TeleBT v4.0 by
+[Advanced Circuits](http://4pcb.com), received 2017.07.21.
+
+## sn 3939 ##
+
+Errant TeleDongle v3.0 found in Bdale's collection.
+
+## sn 3940-4189 ##
+
+Production run of 250 pieces of TeleGPS v2.0 by
+[Advanced Circuits](http://4pcb.com), received 2017.09.16.
+
+## sn 4190-4439 ##
+
+Production run of 250 pieces of TeleMega v3.0 by
+[Advanced Circuits](http://4pcb.com), received 2017.11.30.
+