+## sn 691-834 ##
+
+Production run of 144 pieces of TeleMini v1.0 by
+[Advanced Circuits](http://4pcb.com), received 2011.07.25.
+
+## sn 835-941 ##
+
+Production run of 107 pieces of TeleMetrum v1.2 by
+[Advanced Circuits](http://4pcb.com), received 2011.12.15.
+
+## sn 942-1049 ##
+
+Production run of 108 pieces of TeleMetrum v1.2b by
+[Advanced Circuits](http://4pcb.com), received 2012.10.29.
+
+## sn 1050-1169 ##
+
+Production run of 120 pieces of TeleBT v1.0 by
+[Advanced Circuits](http://4pcb.com), received 2013.04.08.