Assertion: clarinet's predecessor | /r/HasProperty | the albert system
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text: However, bass clarinets are also manufactured in Germany with the Oehler system of keywork, which is most often known as the 'German" system in the US, because it is commonly used in Germany and Austria, as well as Eastern Europe and Turkey; bass clarinets produced with the Oehler system's predecessor, the Albert system, are still in use, particularly in these areas.[citation needed]