Keabsahan Kuasa Untuk Menandatangani Akta Jual Beli Yang Diberikan Oleh Suami Tanpa Persetujuan Bersama Kepada Perseroan Terbatas dan Perlindungan Hukum Bagi Para Ahli Waris (Studi Putusan Mahkamah Agung Nomor 909/PK/PDT/2020) = The Validity of The Power of Attorney to Sign The Deed of Sale and Purchase Granted By The Husband Without Mutual Consent To The Limited Liability Company and Legal Protection of The Heirs (Case Study of The Decision of The Supreme Court Number 909/PK/PDT