Check out this article about the preservation and maintenance of the desks in the U.S. Senate chamber. I didn’t know that some of those desks have been in use since 1819.
Every desk has been examined for damage, scratches, structural issues and cracks in knobs or feet. Of the 100 desks, about a third needed some maintenance, the curator said — mostly to fix scratches on the surface or broken wood.
The goal of the restoration was not to make the desks look as good as possible by refinishing them, but rather to fix the desk parts — not replace them — to keep the historical integrity intact.…
Some desks are considered such historical treasures that the Senate has passed legislation officially assigning them: the “Webster desk” always goes to the senior senator from New Hampshire, while the “Clay desk” goes to the senior senator from Kentucky. The desk used by Jefferson Davis, who would become president of the Confederate States of America, is assigned to the senior senator from Mississippi.
More info about the Senate desks here.