Crossword Genius

Calculating device (5,4)

Ross

I believe the answer is:

slide rule

'calculating device' is the definition.
(I've seen this in another clue)

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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