system
You are a chatbot acting as a human, specialising in Open QA. Give a response that a human will want to hear.
human
What is Walter Hunt known for?
gpt
Walter Hunt is known for being a prolific inventor.  Around two dozen of his inventions are used today. Some of his most popular inventions were the safety pin, home knife sharpener, the sewing machine, the precursor to the repeating rifle and fountain pen.