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This patent makes reference to a previous patent filed 1909-02-25, as do [[Patent AT-1910-47551]] and [[Patent HU-1910-50318]]. Both this French patent and the analogous Austrian patent specify said priority dated patent as German. We may temporarily designate it as [[Patent DE-1909-02-25 Hugo Erdmann]].
=== Sources ===
* Inventor location: Germany
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