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KZRH

1939–1946

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Originally signed on the air on July 15, 1939, as KZRH, a NBC Radio Network affiliate and one of many radio stations that used the U.S. ITU prefix during the time when the Philippines was still a commonwealth.

1946–1948

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DZRH

1948–1985

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In 1948, after the international telecommunications conference in the United States where the Philippines changed its first letter to "D", KZRH changed its callsign to the current DZRH, and has been expanded to over 30 stations nationwide. The same year, MBC launched its sister station in Manila, DZMB and DZPI. The frequency was also changed from 650 kHz to the current 666 kHz in November 1978, due to the switch of the Philippine AM dial from the NARBA-mandated 10 kHz spacing to the 9 kHz rule implemented by the Geneva Frequency Plan of 1975.

1985–2003

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In 1985, DZRH revived its first logo with the yellow rectangle embedding the MBC Radio logo in the left, and the old DZRH wordmark set in red large Helvetica Black typeface.

2003–present

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In 2003, DZRH changed its new logo with the yellow rectangle with the DZRH News logo in the left set in Arial Black font, the DZRH wordmark set in large red Helvetica Black remained and underneath the DZRH wordmark are the words No.1 set in smaller red Arial Black font and the words "Kaunaunahan sa Pilipinas" set in medium green Arial Black typeface.

Special Logos (Anniversary)

2014–2015

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2015–2016

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2016–2017

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2017–2018

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2018–2019

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2019–2020

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2020–present

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