Blue M was founded in 1946. Blue M Electric was acquired by General Signal Corporation and incorporated into their Lindberg Unit. Aerotronics Inc. was acquired by General Signal and incorporated into Blue M. The Blue M product brand is recognized in the industry as a leader in the design, manufacture and support of industrial ovens, inline curing ovens, light industrial furnaces, custom industrial ovens, and ASTM test ovens. These industrial ovens accommodate a wide range of applications and configurations to meet virtually any thermal processing requirement.