Instrument of accession of Kashmir was signed by?

Instrument of accession of Kashmir was signed by?

کشمیر کے الحاق کے دستاویز پر کس نے دستخط کٰٗے۔
Explanation

Maharaja Hari Singh and the Indian government negotiated the terms of the Instrument of Accession

Signed 26 Oct 1947

Effective on 27 Oct 1947

This document allowed Jammu and Kashmir to join India.