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This was a fascinating low-budget SF movie. Four guys run a garage company in their spare time making error-correction devices. Two of them agree to work on a new project and it surprisingly turns out to allow a form of time travel. We see both the originals and the duplicates. What would you do with time travel? These guys decide to make money via stocks, but that's not all that happens. Listen carefully, that's where the information is. The end has a great twist. Recommended.