Keabsahan rapat umum pemegang saham melalui penetapan ketua Pengadilan Negeri : studi kasus terhadap penetapan ketua Pengadilan Negeri Semarang Nomor 23/PDT.P/2004/PN.SMG = The validity of the general meeting of shareholders through the designation of chairman : a case study of the determination of the chief Court Number 23/PDT.P/2004/PN.SMG