Details:

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.

Usage:

Addition/subtraction:

Enter a number and hit the “+” or the “-” key.

Multiplication:

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.  

Division          

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:

• Several keys and switches make this a very versatile calculator.  Some of them are explained in a picture that can be found on the assets page.

Click to view a full size picture (opens in a new tab)

Serial number:

Built in:

Functions:

Rotation speed:

Market-introduction:

Production until:

Price:

914841JJ

Second half of 1960

Addition, Subtraction, Fully automatic  Multiplication and  Fully automatic Division

1959

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)