"only established in" is a correct and usable phrase in written English.
You can use it when you want to emphasize that something happened or began in a particular time or place. For example, "driving lessons for teenagers were only established in the United States in the 1980s."
Cottonwood and willow only established in wetted, cleared treatments, and establishment was variable in these treatments due to variable site conditions and inundation duration and timing.
Our childcare commission was only established in April.
Remember, the line of succession beyond the vice president was only established in 1947.
The principality, known for its welcoming banks, was only established in 1719, though the princes actually went on living in Vienna and buying lots of paintings, as well as many other items, on show at the Liechtenstein museum in Vienna.
Although St Matthew's abuts Wyckoff-Snedeker, neither Mr Smith nor anyone else at the church knew who was buried there (the church was only established in 1900).Mr Cogan and Mr Smith eventually learned not only the names of the 136 descendants of Queens's early Dutch settlers who were buried at Wyckoff-Snedeker, but also the correct placement of the headstones.
The U.K. Space Agency was only established in 2010.
Louis van Gaal wants to sign a right-back because the United manager has little faith in Rafael da Silva, the only established player in the position.
Pilot studies suggested that these cells only established well in nude mice if implanted in Matrigel.
Chris Killip is the only established photographer in a shortlist full of artists.
The 21-year-old has been at the club since 2009 but only established himself in the first team last season, making 30 appearances.
Hammond is the only established left-hander in the Yankees' bullpen, and he will be 37 in January.
