Assertion: pendulum clock | /r/CreatedBy | ketterer
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text: This statement was corroborated by Gerd Bender in the most recent edition of the first volume of his work Die Uhrenmacher des hohen Schwarzwaldes und ihre Werke (The Clockmakers of the High Black Forest and their Works) (1998) in which he wrote that the cuckoo clock was not native to the Black Forest and also stated that: "There are no traces of the first production line of cuckoo clocks made by Ketterer".