How does this "respect" account for independent invention? Many things (telegraph, telephone, Tee Vee, automobiles, Knuth-Morris-Pratt pattern matching) are in

How does this "respect" account for independent invention? Many things (telegraph, telephone, Tee Vee, automobiles, Knuth-Morris-Pratt pattern matching) are invented nearly simultaneously by several inventors. If "intellectual property" is property, how can more than 1 person own it? If you don't account for independent invention, your "respect" is fake, and doesn't take into account the labor of the independent inventor.