Who were the muezzins of the Messenger of Allah, peace and blessings be upon him?

The Prophet, peace and blessings be upon him, had three muezzins: Bilal, Abu Mahdhurah, and 'Amr ibn Umm Maktum. The fourth was Sa'd al-Quraz, who would give the adhan in Quba. Bilal was the regular muezzin, Ibn Umm Maktum would give the adhan for Fajr, Sa'd al-Quraz was the muezzin in Quba, and Abu Mahdhurah was in Mecca. It was reported that 'Abdullah ibn Zayd once gave the iqamah by the Prophet's command, but its chain of narration is weak.