JUMO 705040 mTRON T - Router Module Operating Manual - Manual (Page 28)

4 Identifying the device version
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Fabrication no. (F-Nr)
Among other things, the fabrication number contains the date of production (year/week).
Example: F-Nr = 0070033801211010006
The figures concerned are in positions 12, 13, 14, and 15 (from the left).
The device was therefore produced in the 1st calendar week of 2011.