Door Knob

Osbourn Dorsey
It wasn't until 1878 that inventor Osbourn Dorsey filed a patent for the doorknob mechanism we know and love, and along with it the first internal door-latching mechanism.

Harvey Hubbell II (1857 – December 17, 1927), was an American inventor, entrepreneur and industrialist. His best-known inventions are the U.S. electrical plug and the pull-chain light socket.

The art of Lithography was invented by Czech named Alois Senefelder in 1798 in Austria. By 1848, the process had been refined to the point that it was possible to print 10,000 sheers per hour, however, Jules Cheret was the first person to produce posters in mass through lithography.