April 4 is reserved to Linus Yale Jr.
Linus Yale, Jr. (April 4, 1821 – December 25, 1868) was an American mechanical engineer and manufacturer, best known for his inventions of locks, especially the cylinder lock. His basic lock design is still widely distributed today, and constitute a majority of personal locks and safes.
Bio:
http://www.britannica.com/biography/Linus-Yale
Linus Yale, Jr. (April 4, 1821 – December 25, 1868) was an American mechanical engineer and manufacturer, best known for his inventions of locks, especially the cylinder lock. His basic lock design is still widely distributed today, and constitute a majority of personal locks and safes.
Bio:
http://www.britannica.com/biography/Linus-Yale
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