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に署名した

signed

→ に
phrase Uncommon #16,766
signed Used to say that someone signed a document or agreement. The に marks what was signed, and 署名した is the plain past form of 署名する.
JA: 彼女は契約書に署名した。
EN: She signed the contract.

彼は小切手に署名した。

He signed the check.

ジョンソン氏は突然考えを変え、契約書に署名した。

Mr. Johnson suddenly changed his mind and signed the contract.