Linus Yale, Jr., American engineer and businessman (d. 1868)
Linus Yale Jr. (April 4, 1821 – December 25, 1868) was an American mechanical engineer, manufacturer, and co-founder of the Yale Lock Manufacturing Company. He is best known for his inventions of locks, especially the cylinder lock. His basic lock design is still widely distributed today, and constitutes a majority of personal locks and safes.

1821Apr, 4
Linus Yale, Jr.
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Events on 1821
- 22Feb
Danubian Principalities
Greek War of Independence: Alexander Ypsilantis crosses the Prut river at Sculeni into the Danubian Principalities. - 8May
Battle of Gravia Inn
Greek War of Independence: The Greeks defeat the Turks at the Battle of Gravia Inn. - 26May
Greek War of Independence
Establishment of the Peloponnesian Senate by the Greek rebels. - 23Jul
Monemvasia
While the Mora Rebellion continues, Greeks capture Monemvasia Castle. Turkish troops and citizens are transferred to Minor Asia coasts. - 28Nov
Gran Colombia
Panama Independence Day: Panama separates from Spain and joins Gran Colombia.