700 years of occupation of India

Why there could not be technological transfer to us?

The general policy of most of the rulers during the 700 years of Muslim occupation of India was to systematically replace the fabric of Hindu society and culture with a Muslim culture. They tried to destroy Indian religions language, places of knowledge (universities e.g Nalanda and Taxshila were totally destroyed by Muslims). 

They destroyed and desecrated places of thousands of temples including Somnath, Mathura, Benaras, Ayodhaya, Kannauj, Thaneswar and in other places. 

There was wholesale slaughter of the monks and priests and innocent Hindus with the aim to wipe out the intellectual bedrock of the people they overran.

The Musliims could not subjugate India with ease and were never able to rule it entirely. There was a valiant and ceaseless struggle for independence by Hiindus to deliver India from Musliim tyranny. The Rajputs, Jats, Marathas and Sikhs led this struggle in North India. 

In the South this struggle was embodied in the Vijayanagar Empire. This struggle culminated when the Marathas ended to the Musliim domination of India.