We are hereby handing over the operation manuals for the project which was being completed
We are hereby handing over the operation manuals for the project which is being completed.
We are hereby handing over the operation manuals for the project being completed.
All 3 are correct grammar. #2 and #3 mean that the project is not yet completed. #1 implies that.
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All 3 are correct grammar.
#2 and #3 mean that the project is not yet completed.
#1 implies that.