Milton Jeffers’s most notable invention is undoubtedly the simple adding machine. Jeffers received his patent in 1863, which describes the device as a lever-set non-printing adding machine.
The first came in 1868 and was a combined fodder cutter and corn husking machine. With this farming machinery, corn stalks passed between a set of rollers.
If Milton Jeffers had a wife and children outside of his career as an inventor, then their names, birthdates, and death dates are not commonly known or easily discoverable online.