DS-39 [SEP] service entry
What year was DS-39 made? What year did DS-39 come into use? What was the year that DS-39 entered service? What year was DS-39 commissioned? What year was DS-39 introduced? What year was the service entry date for DS-39? What was the year DS-39 entered service? Which was the official year for the approval of DS-39? In what year did DS-39 enter service? In which year was the service entry date for DS-39?
1939
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Section::::Abstract.
DS-39
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