The Friden SBT10 is a very luxury full function mechanical calculator. It has functions which are available on very few machines like a result register that can be split into two parts where both parts support back transfer to the input register (keyboard). There is also the option to totalise results of a series of multiplications in the counter register.
Because of its versatility it’s not an easy machine to 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 lower 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 the1968/1969 edition; price DM 4850)
Approx. DM. 4950 in 1963 and DM. 4850 in 1968 (Source: Büromaschinen Lexikon)
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