Where It All Began In 1872, a German chemist, Eugen Baumann, created Polyvinyl chloride (PVC), though […]
…………………………………………………………………………………………………………. यो मुलुक सिंगापुर जस्तो बनिसकेको छैन मात्र राजनीतिक परिवर्तन...