Patent drawing - Accordina drawing from US Patent 2461806 Public domain image
Резюме
Drawing from U.S. Patent 2,461,806 describing André Borel's improved "chromatic harmonicon" with chromatic button accordion keyboard. This instrument, a type of melodica, is better known as the accordina.
Тэги
Дата
16/05/2013
Источник
USPTO
Ссылка
Информация о правах
public domain