Patent drawing for patent #3,071,243 issued on 1/1/1963.
Robert Allen #3,071,243
Patent Drawing 4
Vertical coin counting tube
Patent Drawing Sheet 4
African American Patent Holders - Black Inventors
Black History - Trivia & Books
Books on Black History - Compare PricesBlack History Trivia QuizColors of Innovation - Black History
Suggested Reading
What is a Patent?What Does the Term "Invented an Improvement" Mean?What is a Patent Drawing?
Related Articles
Top Related Searches patent