The Friden SBT10 is a very luxury full function high-end mechanical calculator. It has functions which are available on very few machines like a result register that can be split in two parts and a counter register which can be used to totalise results of a series of multiplications.
Because of its versatility it’s not an easy machine top operate.
Enter a number and hit the “+” or the “-” key.
Enter the first number on the dedicated 10-digit keyboard. Enter the second number on the main keyboard . Multiplication is executed when the “MULT”, “ACCUM MULT” or “NEG MULT” are pushed.
Enter the first number and hit the “DIVD” key. Next enter the second number. When now both “:” keys are pushed the division is executed. The result appears in the upper register.
Function of some special keys, switches etc:
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Second half of 1960
Addition, Subtraction, Fully automatic Multiplication and Fully automatic Division
1965 (Büromaschinen Lexikon still contains this calculator in 1967)
Ca. DM. 4950 in 1963 (Source: Büromaschinen Lexikon)
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