I recently spoke at a technolgy symposium at MSI (The Museum of Science and Industry) in Chicago. It’s an incredible museum. It is housed in the only in-place surviving building from the 1893 World’s Columbian Exposition, the former Fine Arts Building. In their basement they have a U-boat that was captured at the end of World War II.
From the MSI website:
“The U-505 Submarine resurfaces in a 35,000-square-foot interactive exhibit that immerses guests in the sub’s compelling tale through dramatic representations, interactive challenges and nearly 200 artifacts.”

The standard in buttons and controllers.
These guys have everything. If you are looking for a hard to find piece of hardware for an exhibit, this is the place to go.