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| 1977 | 10 | Pioneer corporation established its semiconductor research Lab. |
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| 1978 | Relocated its Lab. to Kofu, Yamanashi, present location. | |
| 1981 | 4 | Started development of semiconductor for its own product. |
Started mass production of IC |
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| 1985 | 10 | Pioneer corporation transferred of semiconductor operations to "Pioneer video corporation",and started sales products to outside of pioneer group. (Mainly audio and video IC products) |
| 1986 | Started mass production of IC(PA0021) for TV. |
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| 1987 | Started mass production of IC(PD0026A) for car audio. |
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| 1989 | Started mass production of Micro computer(PD0048) |
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| 1993 | 6 | Obtained ISO 9001 certification. |
| 1994 | Started mass production of OEIC(CA0010A) |
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| 1998 | 7 | Obtained ISO 14001 certification. |
| 1999 | Started mass production of PJCON(CM0006AF) |
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| 2001 | 1 | Started operation of 6 inch wafer process line (Bipolar). |
Started mass production of IC(PD0272A) for digital video. |
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| 2003 | 4 | Established "Pioneer Micro Technology corporation". |
| 2006 | Started mass production of LCD-Driver. |
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| 2008 | Started mass production of OFDM Demodulation IC(CM0050BB) for ISDB-T terrestrial digital broadcasting |
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| 2009 | 9 | Transferred ISO 14001 certification to the Pioneer Group. Integrated Certification. (pioneer obtained its certification on Jan,1999) |
| 2013 | Started mass production of Ambient light sensor(CPS295HT). |
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| 2015 | Started mass production of RGB Color sensor(CPS289AT) |
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| 2016 | Started mass production of IC(CA0022AN) for Automotive. |
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| 2020 | 10 | Changed the company name to "YITOA Micro Technology Corporation" |
