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The earliest pin-tumble locks were made over 4,000 years ago by the Egyptians. But due to their large, cumbersome size and since they were made of wood, the locks were not practical to use. [ 104 ] In 1848, Linus Yale, Sr. invented the modern pin-tumbler lock. [ 105 ]
The first crewed space flights were made in early 1961, first by Soviet cosmonaut Yuri Gagarin and then by American astronaut Alan Shepard. From those first tentative steps, to the 1969 Apollo program landing on the Moon, to the reusable Space Shuttle, the American space program has created a large display of applied science.
By 1800, many political leaders were convinced that slavery was undesirable, and should eventually be abolished, and the slaves returned to their natural homes in Africa. The American Colonization Society , which was active in both North and South, tried to implement these ideas and established the colony of Liberia in Africa to repatriate ...
[19] [20] This Confederate Patent Act explicitly allowed slave owners to patent inventions made by their slaves, in contrast to United States patent law, which had previously denied such applications. [18] On June 28, 1864, Montgomery, no longer a slave, filed a patent application for his device, but the patent office again rejected his ...
It ruled that neither slaves nor their owners could receive patents on inventions devised by slaves because slaves were not considered citizens and the slave owners were not the inventors. [ 2 ] [ 11 ] Later, both Joseph and Jefferson Davis attempted to patent the device in their names but were denied because they were not the "true inventor."
It’s one of many historical inventions that were way ... There would be a need for a slave or a laborer to constantly maintain the fire at just the right level for the comfort of the people ...
From the first Apple computer to the COVID-19 vaccine, here are the most revolutionary inventions that were born in the U.S.A. in the past half-century.
British textiles had expanded with no change in ginning principles in centuries. For the American planter class, up front costs were higher but productivity improvement among their slaves were clear and Whitney's original 1794 gin design was copied by many and improved upon. [9] [10]