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Ready reckoner for interest calculations patented 1906

1915-1925

Timetable or rent rule

1840-1850

Circular A62 purchase discount ready reckoner calculator in plastic sleeve by Fearn Calculators limited

1965-1975

Blundell Rules Limited (B.R.L.) C24, 'Cost & Profit Reckoner' in cardboard case.

Blundell Rules Limited C24 'Cost & Profit Reckoner'

1955-1965