Record

NCB - National Coal Board, later British Coal Corporation - 1574-1994
- A - Pre-Vesting Colliery Companies superseded by the National Coal Board - [1672]-1972
  - BUT - Butterley Company Colliery Offices - 1857-1960
    - 13 - Butterley Company Colliery Offices records on the development of collieries - 1895-1947
      - 11 - Butterley Company Colliery Offices correspondence files and records on the cleaning and washing of coal - 1920-1947

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Archive Reference / Library Class No.	NCB/A/BUT/13/11/2
Former Reference	N4/125
Title	Index volume named "Rheolaveur", possibly for correspondence or accounts of Euston Mitton relating to the coal washing plant
Date	[1920s]
Description	Eustace Mitton was the mining engineer and a director of the Butterley Company, who was said to have been the person who introduced the Rheolaveur coal washing process into the United Kingdom, a process developed in Belgium in the early 1910s.
Extent	1 volume
Level	Item
Repository	Derbyshire Record Office
Archive Creator	Butterley Company
Archive Creator	National Coal Board

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