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National Coal Board Production Department
Diwydiant
Man-riding Underground by Rope and Locomotive Haulage (booklet)
National Coal Board Production Department
2001.1/872
Mwy am yr eitem hon
Diwydiant
Feeder Conveyors from Face to Gate Roads (booklet)
National Coal Board Production Department
2018.42/123
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Diwydiant
Bunker Conveyors (booklet)
National Coal Board Production Department
2018.42/201
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Diwydiant
Summaries of Technical Articles (list)
National Coal Board Production Department
2001.1/1062
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Diwydiant
Number of Holes and the Charge per Round in Stone Drifts (booklet)
National Coal Board Production Department
2001.1/1038
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Diwydiant
Cable Belt Conveyors (booklet)
National Coal Board Production Department
2018.42/92
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Diwydiant
Statistics of Mechanised Output for the year ended March 1965 (booklet)
National Coal Board Production Department
2018.42/203
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Diwydiant
Diesel Locomotive Outlines (booklet)
National Coal Board Production Department
2018.42/9
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Diwydiant
Longwall Working with a Scraper Bucket at Mossfield Colliery (booklet)
National Coal Board Production Department
2018.42/111
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Diwydiant
Testing of Colliery Wire Ropes (booklet)
National Coal Board Production Department
2018.42/127
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Diwydiant
Charging and Changing of Locomotive Batteries underground (booklet)
National Coal Board Production Department
2018.42/148
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Diwydiant
Statistics relating to Mechanised Output for 1958 (booklet)
National Coal Board Production Department
2018.42/165
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