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Face performance calculator
Face performance calculator used at Wolstanton Colliery. Plastic circular base with six rings of figures at intervals, covered by clear plastic. In centre of calculator is moveable clear plastic rider with markings, secured by brass stud. Instructions for use printed on reverse of calculator.
Collection Area
Industry
Item Number
1994.177/2
Acquisition
Purchase, 3/11/1994
Measurements
diameter
(mm): 192
Length
(mm): 200
Material
plastic
metal
Location
In store
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