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- A - Pre-Vesting Colliery Companies superseded by the National Coal Board - [1672]-1972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
      - 12 - Butterley Company Colliery Offices correspondence files and volume on stonedusting - 1910-1946

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Archive Reference / Library Class No.	NCB/A/BUT/13/12/10
Former Reference	N5/201
Title	Butterley Company correspondence file on application for patent for apparatus for distributing incombustible dust in mines
Date	Jan 1941-Mar 1941
Description	Including copy of provisional specification, Jan 1941, correspondence with patent agents William Swindell and Son of Derby, and notice of receipt of specification by the Patent Office, Mar 1941. Invented by William Stanley Fletcher
Extent	1 file
Level	File
Repository	Derbyshire Record Office
Archive Creator	Butterley Company
Archive Creator	National Coal Board

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