Sliderule : Rare 'Grid Iron' type
Rare 'Grid Iron' sliderule designed by Major General Hannyington c. 1884 made by Aston & Mander 1917 Ltd. London.
Provenence: London School of Economics
given as a retirement present see dedication note on rear (photo)
Condition: near perfect twp small pieces of veneer missing from the bottom edge see photo.
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