which operates vs operating

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Senior Member
Hi, I would like to please ask you which of the options in bold is correct in the following:
He was assigned to a team of five people charged with the design, implementation, and testing of an apparatus (which operates)/operating at extremely low temperatures for engineering applications.
  • PaulQ

    Senior Member
    English - England
    I would prefer "which operates".

    PS You need to re-position "for engineering applications" - as it stands, the sentence is ambiguously wrong.
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