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Amgueddfa Cymru – Museum Wales
Blue hardback cover. On the front cover, there is a white label with 'NATIONAL COAL BOARD [printed in black ink] / BEARING TEMPERATURES / No.2 FAN [handwritten in blue ink]/ COMPRESSOR LOG SHEET' [printed in black ink]. August 1983 - July 1985. Inside, there are pre-printed tables (in black ink), with handwritten details filled in in blue ink, black ink, pencil and green pencil.
