Small tip. The Internet Archive has copies of a giant amount of websites and they're dedicated to archive the digital age. If Mr. Polt's website ever disappears, you can view it here:
https://web.archive.org/web/20180412085503/https://site.xavier.edu/polt/typewriters/index.html
Sorry for using code tags, but the forum software breaks on trying to link to that page directly... You can read more about the Internet archive on their website.