The story
Murex was founded in 1909 as an iron founder and a ferroalloy manufacturer. The company moved to Rainham, Essex in 1917.
In the 1930s, Murex made large quantities of electrodes at their factory in Waltham Cross, and many ships including HMS Ark Royal and Queen Elizabeth 2 have been welded using Murex equipment.
The business was sustained by a high level of activity during World War II, but after the war ended, its profits reduced substantially.
It fell out of the FT 30 index in 1967 when its share price declined, and it was replaced by Beechams.
Welding equipment made by Murex occasionally comes up for sale.
From Wikipedia’s article on Murex (company), shared under CC BY-SA 4.0.3