Our long-standing expertise is in developing and manufacturing heat transfer equipment, and the story of our journey is studded with iconic products and company milestones.


The British first developed the idea of individually replaceable cooling tubes held in headers with rubber seals during WWII desert tank warfare. The concept had these advantages:

  • The flexible seals would allow damaged tubes to be removed and replaced even under combat conditions.
  • The seals would absorb vibration pounding and thermal shock that would cause conventional radiators to leak.

Following WWII, Rolls-Royce motor cars and commercial vehicles were equipped with these radiators. In the early ‘50s, the radiator core first appeared on haul trucks in Canadian ore mines in Labrador.

In 1957, L&M Radiator acquired the rights to the concept and brought the radiator to the Minnesota Mesabi Iron Range. With rapid acceptance of the “MESABI® Radiator” in the mining industry, the concept grew in popularity worldwide as both an OEM and aftermarket product for all mobile and stationary heavy-duty equipment.

Today, the MESABI® replaceable tube concept, first developed for engine cooling, has been applied by L&M Radiator to all types of heavy-duty equipment heat transfer. MESABI® heat exchangers are the world standard for heat transfer reliability.

1957 –

L&M Radiator founded by George Langer (L) and Clay Murray (M) in Hibbing, Minnesota

1961 –

Alex Chisholm (Clay Murray’s son-in-law) joins L&M Radiator

1967 –

L&M opens a production facility in Hermosillo, Sonora, Mexico

1972 –

L&M opens a production facility in Perth, Australia

1975 –

Alex Chisholm is nominated as Minnesota Small Business Man of the Year

1981 –

Alex Chisholm is inducted into the Minnesota Business Hall of Fame

1990 –

Introduced and filed patents for RTTS

1993 –

Introduced and filed patents for V-Core Radiators to be used in bus & underground industries with areas of high contamination

1997 –

Dan Chisholm becomes President of L&M Radiator, Inc. and Alex Chisholm becomes Chairman of the Board

2005 –

Introduced and filed patents for CSC (Captured Seal Cooler)

2007 –

L&M celebrated its 50th anniversary and opened a production facility in Yankton, South Dakota

2011 –

L&M opens a production facility in Antofagasta, Chile.

2017 –

Mexico celebrates its 50th Anniversary. L&M continues its third generation of family ownership and management.