From Wiki

The inevitable temporary page with a list of categories to kick things off

• Barron's
• Blundell
• C-Thru
• Caltech
• Concise
• Cruver
• Davis
• Farmar's
• General Electric
• Jeppesen
• Moonstick
• Perrygraf
• Sterling
• US Army
• Weems and Plath
• Unknown Manufacturer