File:Speaking machine - consists of organ-pipes, generating sound similar to vowels - Wien Modern 2007 (2007-11-18 18.48.19 by tea610).jpg
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Speaking_machine_-_consists_of_organ-pipes,_generating_sound_similar_to_vowels_-_Wien_Modern_2007_(2007-11-18_18.48.19_by_tea610).jpg (352 × 288 pixels, file size: 26 KB, MIME type: image/jpeg)