When central nervous system involvement occurs, making an accurate diagnosis of the condition can be challenging, especially given the current definition for definite neurosarcoidosis requires histologic confirmation of the affected tissue (brain biopsy).
There is no disputing it. The oldest hamburger restaurant chain in the United States is White Castle. The first White Castle restaurant opened in Wichita, Kansas, in 1921. The first McDonald's didn't open until 1948, by comparison.
So what are the oldest US companies? Take a look at this list and that will give a guide to what companies are centuries old, from the oldest corporation in America to the oldest hotel in the US.