Dräger Pac 7000 Notice D'utilisation page 223

Notes on Approval
Marking
*)
Serial No.
* The year of manufacture is indicated by the third letter in the serial number:
D = 2012, E = 2013, F = 2014, H = 2015, J = 2016, K = 2017, L = 2018 etc.
Example: Serial No. AREH-0054: the third letter is E, which means that the
unit was manufactured 2013.
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