1938
United Tool and Valve Repair opened in Shreveport, LA
1946
United Engines formed and signed as the exclusive distributor for Detroit Diesel Engines in the northern half of Louisiana and southern tier counties of Arkansas.
1967
Acquired Diesel Power Company of Tulsa and Oklahoma City, OK which expanded the territory to include most of Oklahoma.
1970
Headquarters relocated to Oklahoma City, OK
1986
Acquired Wilkerson Detroit Diesel Allison in Little Rock, AR
1994
UE Manufacturing opened in Oklahoma City, OK to provide remanufacturing services to the oilfield industry
2001
United acquired by new ownership group led by Garth Bates and Frank Pool
2002
UE Compression opened in Colorado, adding gas compression products
2011
United Holdings, LLC was purchased by Kirby Corporation out of Houston, TX
.