Velcro
Swiss electrical engineer George de Mestral invented his first touch fastener when, in 1941, he went for a walk in the woods and wondered why Burdock seeds clung to his coat and dog. He discovered it could be turned into something useful. He patented it in 1955 and subsequently refined and developed its practical manufacture until its commercial introduction in the late 1950s.
Twistgrip
Glenn Curtiss, unlikely to have been aware of the prior uses of the twist grip, used it in his 1904 motorcycle land-speed record machine, and is sometimes credited as the inventor of the device. Indian claimed in their advertisements, also for their 1904 models, to have invented the twist grip. Whether Curtiss, Gottlieb Daimler, or Roper, were the true inventors, the 1904 Indian would be the earliest use of the device on a production motorcycle.