Do all computers include one of his inventions?

Yes, all computers include a central processing unit (CPU), which is a fundamental invention of computer architecture. The CPU, often referred to as the "brain" of the computer, executes instructions and processes data. Additionally, many modern computers utilize components and concepts developed by pioneers like John von Neumann, who contributed to the design of the stored-program architecture. Therefore, in a broad sense, computers incorporate various inventions critical to their operation.