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First introduced on screen in 1968, the sonic screwdriver has appeared in a number of adventures, and has been used by most incarnations of the Doctor. Apparently a product of Gallifreyan technology, several versions have been made, both by the Doctor and his associates. The Doctor has had at least seven different versions of a sonic screwdriver, with many of the versions exhibiting similar functions, such as disabling bombs, removing screws, destroying controls and dematerialising his TARDIS. Read more...