In the first Parliament elections which were held in 1951, Seven MPs from North Karnataka comprising Belgaum, Dharwad, Bijapur and Karwar districts had represented Maharashtra state, part known as Mumbai Karnataka. There were 7 parliamentary constituencies for the 4 districts including our Belgaum North and Belgaum south. All those seats were of the Congress.
B N Datar was elected from Belgaum North and Shankargouda Veerangouda Patil from Belgaum South.
In 1956 after the states reorganization was done these 4 districts came under Mysore state and first elections were held in 1957 for Belgaum as a constituency.
I guess I made a Mistake in the post here: It should have been Bombay Province or Bombay State and not Maharashtra as Maharashtra came in existance on 1st May, 1960. Till that time it was Bombay Province not Maharashtra. Therefore the first MP of Belgaum represented Bombay State (Mumbai Rajya) not Maharashtra.
Thanks Mr. SM Katti for that valuable note.