What else did Eli Whitney invent besides cotton gin the interchangeable parts and a gun?

Besides the cotton gin and interchangeable parts for firearms, Eli Whitney also contributed to the development of the milling machine, which allowed for more precise manufacturing. His innovations in mass production techniques significantly influenced the manufacturing industry, paving the way for modern assembly line production. Additionally, Whitney worked on producing muskets for the U.S. government, further advancing the concept of standardized parts in weaponry.