During World War II, the company built an additional building to handle the increased production.

[4] From the 1960s to the 1980s, the company operated a Beech 18 called the Grimes Flying Lab to test its lights.

[8] Then, in 1981, Midland-Ross acquired the Mansfield Aircraft Products Company and made it a subsidiary of what was by then the Grimes Division.

[14] The sale would later be questioned after it was revealed that AlliedSignal pressured credit ratings companies to ignore the unrated bonds of Grimes investors.

[15] AlliedSignal, which would later become Honeywell, maintains as presence at two separate locations in Urbana.