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previously; already; for some time; for quite a while
かねてから希望していた部署に異動が決まった。
My transfer to the department I had long hoped for was decided.
かねてより交渉を続けていた契約がまとまった。
The contract that had been under negotiation for some time was finalized.
かねて申し上げた通り、来月から新制度が始まる。
As I mentioned previously, the new system starts next month.