Crossword Genius

Calculating device (5,4)

Ross

I believe the answer is:

slide rule

'calculating device' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for slide rule that I've seen before include "Instrument for rapid calculations" , "Obsolete calculator" , "old computer" , "facilitates calculations" , "Old calculating device" .)

I've seen this clue in The Telegraph and The Mirror.
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