Any database claiming a "Full list of LLPs from 1997" is either (a) a type of Limited Partnership (LP, not LLP) or (b) a misclassified entity.
Any search for "LLPs registered in 1997" will return zero results globally. The user likely means "Companies (Private/Public) registered in 1997" or is misremembering the year. -List of Companies-LLPs registered during the year 1997-