T-28 [SEP] service entry
What year was T-28 introduced? In which year was the service entry date for T-28? What year did T-28 come into use? What year is T-28 associated with? What year was T-28 commissioned? What was the year that T-28 entered service? Which was the official year for the approval of T-28? What was the year T-28 entered service? In what year did T-28 enter service?
1933
-1
Section::::Design history.

T-28
198524