In April, 1940, Popular Science ran this little blurb on a novel invetion: The three-hold punch ("Three correctly spaced holes can be cut at the same time in paper used for loose-leaf folders or notebooks").
In April, 1940, Popular Science ran this little blurb on a novel invetion: The three-hold punch ("Three correctly spaced holes can be cut at the same time in paper used for loose-leaf folders or notebooks").