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Individual
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Individual
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Priority to DE1955R0010165priorityCriticalpatent/DE1710089U/de
Publication of DE1710089UpublicationCriticalpatent/DE1710089U/de
Αυτοματον εποπτικον οργανον αληθους και μεσου ηλιου μετα προσθηκης δια την ευρεσιν της γεωγραφικης θεσεως (στιγματος) με βασιν την υδρογειον κινουμενην εις σταθερον σημειον περι τον αξονα της και σχετικων αποκλισεων.