British Jeffrey-Diamond
of Wakefield, Yorkshire.
1897 Company formed.
1922 Private company formed.
Apparently the Jeffrey Manufacturing Co of Columbus, Ohio acquired The Diamond Coal Cutter Company Ltd of Wakefield in 1926, and renamed it British Jeffrey-Diamond Limited.
Maker of roll breakers for use in gas works[1]
NCB gave licences for manufacture of the the Anderton shearer loader to Eickhoff GmbH, British Jeffrey Diamond and Anderson, Boyes and Co.
1961 Manufacturers of pulverisers, crushers and conveyors and coal face mining machinery. 1,300 employees.