Slow to duplicate

This duplicate invention comes about 33 years! after I invented it in the first place. This news out of DefCon is really old news to me. How many things I have invented and forgotten,how sad. This is thirty three years late, wow! What are the odds that somebody will duplicate my gravity technology in the next 200 years? I couldn't even guess, some things get dup'd in days and some never. I guess it is the fact that there are so many possible answers and people keep creating things that I rejected as implausible to maintain. I have found that it doesn't matter if you have a key when the inside of the space is just as accessible as the outside.