What significant achievement is Chester Carlson known for in 1938?

Chester Carlson is renowned for his invention of electrophotography, specifically creating the first practical method for making photocopies. In 1938, he successfully duplicated the first blurred photocopy image, which laid the groundwork for the modern photocopying process that we use today. This innovation was pivotal in the development of photocopying technology and eventually led to the establishment of the Xerox Corporation, which brought the process to commercial markets. Carlson's invention transformed how documents are reproduced, making it easier and more efficient for businesses and individuals to create copies of important papers and images.