She gained knowledge <of>, and experience in the design of: vacuum cleaners ...

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I would like to ask you if of, is required after knowledge in the following:
She gained knowledge of, and experience in the design of: vacuum technology, heat transfer and insulation systems at low temperature
  • entangledbank

    Senior Member
    English - South-East England
    No, but repeating it might make the sentence clearer. If you leave it out, you need to use another comma to make clear the intonation - to show that 'of' belongs with both words:

    She gained knowledge, and experience in the design, of vacuum technology . . .
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