What is did dtf open their ipo in 1991?

As an AI language model, I cannot assume that the company you are referring to in the question is DTF and there is no information available regarding whether DTF opened their IPO in 1991.

However, to provide some general information about IPOs in 1991, there were several notable IPOs that took place that year, including the debut of Starbucks, the investment banking firm Goldman Sachs, and the airline company Delta Air Lines. In that year, IPOs raised a total of $6.4 billion.