The "Proell" pocket calculator

The Proell' pocket calculator, with booklet of instructions

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The Proell' pocket calculator, with booklet of instructions
Science Museum Group
© The Board of Trustees of the Science Museum

The "Proell" pocket calculator, with booklet of instructions, contained in linen case 6" x 4"

Details

Category:
Mathematics
Object Number:
1951-692
type:
ready reckoner
credit:
Dr W.L. Hildburgh