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- A - Pre-Vesting Colliery Companies superseded by the National Coal Board - [1672]-1972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
      - 8 - Butterley Company Colliery Offices correspondence files on the development of pit supports and other mining equipment - 1929-1947

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Archive Reference / Library Class No.	NCB/A/BUT/13/8/6
Former Reference	N5/416
Title	Butterley Company correspondence file on the invention, patenting and improvement of the Hunt Variable Gear
Date	Feb 1936-Jan 1938
Description	Including copy of letters patent, dated 6 April 1934, sealed 6 March 1938, draft agreement between William Hunt of 95 Sandbed Lane, Belper, and the Butterley Company on the invention, 1938, copies of draft provisional specifications for improvements, Jan 1938
Extent	1 file
Level	File
Repository	Derbyshire Record Office
Archive Creator	Butterley Company
Archive Creator	National Coal Board

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