What is the process to decide if the tangible invention is a machine, device or apparatus? Any line of thought and supporting examples is appreciated.
A singular \ monolithic invention may fit any of the three. I usually think of a machine or device as monolithic item.
That being said, if the invention is an array of multiple computers to measure phenomena (a system of discrete computers), is the better label for the invention: a measurement apparatus? If there is another label that is not mention and is more appropriate would be of interest.