How many time machines did wells have? Was it just the one, or do you think that it's feasible that he had a backup machine hidden somewhere (just in case)?

I believe there's a hero in all of us that keeps us honest, gives us strength, makes us noble, and finally allows us to die with pride, even though sometimes we have to be steady and give up the thing we want the most. Even our dreams. -- Aunt May, Spider-Man 2