Read the Articles provided and explain it in a concise manner for student understand what are those case study all about. Thank you for advance and i highly appreciate if you type your explanation in a student understanding for us to be familiar with the case study.

Articles.

https://lawphil.net/judjuris/juri1952/jun1952/gr_l-3756_1952.html

https://lawphil.net/judjuris/juri1973/may1973/gr_36840_1973.html

https://lawphil.net/judjuris/juri1968/oct1968/gr_l-26332_1968.html

https://lawphil.net/judjuris/juri1931/sep1931/gr_34840_1931.html