On July 15, 1939 The Headcock Company KZRH in escolta Manila frequency on 650 kHz AM Manila
in 1942 was a japanese Manila
in July 1, 1946 The Headcock Company was a renamed as Manila Broadcasting Company with callsign from KZRH to DZRH DZMB
in March 20, 1949 DZPI was a launch owned by Philippine Broadcasting Corporation in Navotas