日期: 1813
博物馆: Beethoven-Haus Bonn (Bonn, Germany)
术: 铜
当他听力受损的问题变得更加严重时,路德维希·范·贝多芬(英语:Ludwig van Beethoven)试图寻找援助,这将使与其他人的交流更加容易. 于是他联系了著名机械师和发明家约翰·内波穆克·梅尔泽尔(1772年-1838年),他从1792年起就在维也纳居住,1812/1813年前后他一直与贝多芬有密切联系. Mälzel为作曲家开发出多款不同形状的耳角,部分会用金属圆圈接入头部. (在波恩的贝多芬-豪斯可以见到其中四起助听器,另一起是维也纳的音乐爱好者协会。 ) 除了耳号外,梅尔策尔的另外两项发明对贝多芬也变得重要. 一个是
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