Patent Drawing - Figure 1
Bertram Baker - Figure 2Bertram Baker - Text for Patent #1,582,659The First Cash Register
Books on Black History - Compare PricesBlack History Trivia QuizColors of Innovation - Black History
What is a Patent?What Does the Term "Invented an Improvement" Mean? What is a Patent Drawing?
Mary Bellis Inventors Guide
©2013 About.com. All rights reserved.
