Along with the activity of launching of foreign sounding rockets , lot of research and developments were carried out to realize an indigenous rocket. Finally the first rocket made by India was launched from Thumba in 20 - November 1967. It was named Rohini -75 . It was the real beginning of Indian space journey.
Then during 1968-75 time frame indigenous development of various sounding rockets of sizes varying from 75mm to 560mm dia. These rockets were capable of carrying up to 100Kg up to an altitude of 550Km.