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A [[sonic screwdriver]] could project sound to lock or unlock [[door]]s. ([[TV]]: ''[[The Mutants (TV story)|The Mutants]]'', ''[[Aliens of London (TV story)|Aliens of London]]'') | A [[sonic screwdriver]] could project sound to lock or unlock [[door]]s. ([[TV]]: ''[[The Mutants (TV story)|The Mutants]]'', ''[[Aliens of London (TV story)|Aliens of London]]'') | ||
[[Category:Physics from the real world]] | [[Category:Physics from the real world]] | ||
[[Category:Sound]] | [[Category:Sound| ]] | ||
[[Category:Waves]] | [[Category:Waves]] |