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.
Georg Kopprasch
Active in the Berlin horn playing scene in the early 1800s, Kopprasch was acquainted with the inventor of the valved horn, Heinrich Stölzel. Because horns could not play chromatically prior to Stölzel's invention of valves, no chromatic etudes existed for the horn and it is likely Kopprasch composed his now seminal works to fill that need.