A History of Short Words

From the New York Times Crossword Puzzle

EMTS

Sat, 13 May '23
CPR performers
Sun, 23 Apr '23
Many front-line workers, in brief
Sun, 15 Jan '23
Some F.D.N.Y. pros
Thu, 12 Jan '23
CPR specialists
Wed, 23 Nov '22
Some 911 call respondents, in brief
Fri, 19 Aug '22
Many fire dept. members, by training
Tue, 21 Jun '22
CPR specialists
Mon, 13 Jun '22
Ambulance specialists, in brief
Wed, 30 Jun '21
Some first responders, in brief