British 1970's calculator

At its time, this British made (!) calculator was a state of the art high tech product. I got it from my father some 10 years ago when he ceased his work as a civil engineer. It runs on three AA batteries (not for very long) and features the typical red display as used by many Texas Instruments calculators. According to my dad, the greatest thing about this machine was its memory function. It allowed the user to store one (yes, one) result.

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R2D2 - also 1970's, but from a different galaxy