Patent No. EP3919989 (titled "Safety Device With Voltage Monitoring") was filed by Leuze Electronic on May 3, 2021. The application was issued on Dec 8, 2021.

The dossier documents provide a comprehensive record of the patent's prosecution history - including filings, correspondence, and decisions made by patent offices - and are crucial for understanding the patent's legal journey and any challenges it may have faced during examination.
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