There is a great Schick Injector information website by Alan G. Appleby at safetyrazors.net. At some point the website was no longer available and I decided to temporarily host some of the information found there on this website. The original site is back, but I'll keep the information here – just in case – and because I like my layout better. The original site can also be found using the excellent “Internet Archive Wayback Machine”: https://web.archive.org/safetyrazors.net/
This is not my material and it does contain errors.
There are two pages available here: