Production run of 198 pieces of TeleMetrum v2.0b by
[Advanced Circuits](http://4pcb.com), received 2018.03.10.
+## sn 5138-5141 ##
+
+Hand build of 4 pieces of TeleLCO v2.0 by Bdale on 2017.05.27.
+
+## sn 5142-5145 ##
+
+Hand build of 4 pieces of TeleFireEight v1.0 by Bdale on 2017.05.30.