On December 9, 1884, L. M. Richardson patented roller skates with ball bearings. This allowed skaters to gain speed with less efforts. This invention transformed…
On December 8, 1891, Samuel F. O’Reilly patented the first electric tattoo machine based on Thomas A. Edison’s autographic printing pen. He is known as…
Edward L. Van Halen, a guitar wizard, patented a supporting member for his guitar. The invented supporting member allows Van Halen’s to use his two-handed…
On December 7, 1880, Alexander Graham Bell patented photophone, which allowed for the transmission of speech on a beam of light. Bell believed the photophone…
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