began to be production of duck calls made out of materials other than wood such as rubber and acrylic. Phillip Sanford Olt from Pekin, IL was one of the most widely distributed duck calls in the 1900s. He began his duck call company in 1904 with his Arkansas Style duck call which has a straight reed and curved tone board. Most made today still use this same technique. Olt received a patent in 1905 for the first adjustable tone duck call. It was made of a strong hard rubber-plastic that allowed hunters to change the volume and tone of the call. In 1950, Olt developed the Model D-2 Keyhole, which became incredibly popular. Many hunters would modify it to change the sounds and eventually this led to the production of the “cutdown” duck call. Olt's calls were mostly made of rubber and wood, but he did produce some acrylic models. Through 1920-1930s several new duck calls were produced using different styles or techniques to produce different kinds of sounds. Mid-1920s a man named Charles Ditto produced a duck call called the Eureka Model. It was made of two parts and contained a hard rubber insert and brass reed. Mid-1930 through the 1950s, father and son Clarence and Dudley Faulk produced some of the first plastic duck calls as well as several wooden ones. In 1935 using live ducks was outlawed, in the United States and the demand for duck calls increased incredibly. By the 1950s custom call makers were showing up everywhere with the ability to engrave duck calls, include different colors or patterns and generally just make duck calls more showy/fancy. In the early 1940s George Yentzen and his partner Cowboy Fernandez designed, invented, and patented the first double and triple reed duck calls from Black Walnut wood. The first double reed patent was submitted on March 7, 1946 by Yentzen, but did not get approved until September 3, 1950, because only war relief related patents were approved up until 1950. Yentzen died in 1959 prompting Cowboy to take over and start the Sure-Shot Game Call Company, with the most popular Yentzen Double Reed Duck Call. Cowboy won the World Championship and was also crowned the Champion of Champions in Stuttgart, Arkansas in 1959. He was the first Texan to win the two prestigious titles, and marked the first time the World Championship of Duck Calling using a double