This video is a wonderfully-done documentary, written and produced by Michael Rose, on the history of Buick as presented in 1995 from the History Channel's archive.
https://www.youtube.com/watch?v=NnqJXHlChoM
Here is Michael's description of the video verbatim:
"No one would have believed that the tinkering of a plumber would turn into the foundation of the world's largest corporation. But it did. David Dunbar Buick invented a process to adhere porcelain to tubs and other bathroom fixtures. But the Scottish immigrant dreamed of making a mark out of the bathroom, and set to work building a car. By 1900, he enlisted the aid of another inventor, Walter Marr, and they built their first vehicle. Their invention attracted the attention of one of Michigan's wealthiest men, William Crapo Durant, the president of the world's largest buggy-building business. As soon as he drove one of Buick's early creations, Durant realized that the days of the horse and buggy were over. He teamed up with Buick, and the two went on to make history. By the thirties, Buicks were regarded as some of the finest cars ever made. From the first Buicks through the birth of General Motors and into history, this is the compelling story of the partnership that eventually became the basis for the largest company in the world."
https://www.youtube.com/watch?v=NnqJXHlChoM