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Archive Reference / Library Class No.	NCB/A/BUT/13/8/4
Former Reference	N5/209
Title	Butterley Company correspondence file on the Butterley Patent F-Type Pit Prop
Date	Sep 1940-Jan 1947
Description	Including printed specification for patent, 1939
Extent	1 file
Level	File
Repository	Derbyshire Record Office
Archive Creator	Butterley Company
Archive Creator	National Coal Board
Format	Document

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Bryan Donkin Company Ltd of Chesterfield, engineering firm

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