calculator; pipe

Maker
Mear, M H & Co
Production date
Circa 1973
 Description
Pipe calculator used in coal mining. Colour - white red and black.
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Object detail

Department
Object
Maker
Production date
Circa 1973
Production place
Huddersfield/Yorkshire/England
Signature & date
printing:face:"Methane Drainage pipe calculator" [with instructions and scales]
printing:package: "NATIONAL COAL BOARD/METHANE DRAINAGE/ PIPE CALCULATOR."
Measurement type, part and reading
Dimensions:0 - Whole:Dia 19.5cm (Dia 7 11/16")
Accession number
1994-038-016

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