Revision history of "File:Patent-US-1804522.pdf"

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Application date1929年7月3日 (三) +
Application number375764 +
Assigned toLeBoeuf Fountain Pen Co. +
Invented byFrank T. Walsh +
Mention patentFile:Patent-US-1042804.pdf +
Patent date1931年5月12日 (二) +
Patent descriptionCaricamento sleeve filler +
Patent number1804522 +
Patent titleFountain-pen +
Patented byLeBoeuf +
Patented inUS +
Priority date1929年7月3日 (三) +
Used for featureSleeve filler +