Friden SBT10
Friden SBT10

Details:

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.


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 upper register.


Function of some special keys, switches etc:


Calculator Info
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Serial number:

Build 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 1967)

Ca. DM. 4950  in 1963  (Source: Büromaschinen Lexikon)

Repair information & pictures of internals