Wikipedia
Ruston-Bucyrus Ltd was an engineering company established in 1930 and jointly owned by Ruston and Hornsby based in Lincoln, England and Bucyrus-Erie based in Bucyrus, Ohio, the latter of which had operational control and into which the excavator manufacturing operation of Ruston and Hornsby was transferred. The Bucyrus company proper, from which the Bucyrus component of the Ruston-Bucyrus name was created, was an American company founded in 1880, in Bucyrus, Ohio.
During the Second World War, the company developed a trench cutting machine known by the code name Cultivator No. 6 at the behest of Winston Churchill.
A limited company, Ruston-Bucyrus Ltd., was formed in 2005, by Paul and Frank Murray (Brothers) as Co-Directors. This has no ties to RB Cranes which holds all of the original machine information & drawings