There are no such things as inventions that specifically and primarily prolonged slavery. Slavery was a complex social, political, and economic institution that existed in various forms throughout human history. Its causes and duration were influenced by a multitude of factors, including cultural norms, economic incentives, political power dynamics, and global trade. To claim that specific inventions directly caused the prolongation of slavery would be oversimplifying the intricate web of factors that perpetuated this abhorrent practice.