All inventors are magical in so far as all inventions are magic.
There is one difference between the two - once the general inventor gets his product patented and launched on the market he can tell everybody how it works. Not so with the magical inventor. When he or she invents a new trick or illusion, how it works is kept top secret as far as the general public is concerned. The reason why magicians endeavour to keep the workings of their props secret is to preserve the art of entertainment so that families can enjoy this art form for generations to come. Magical inventors invent tricks, illusions and routines.