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Google Patents Improvement in telegraphyĭownload PDF Info Publication number US174465A US174465A US174465DA US174465A US 174465 A US174465 A US 174465A US 174465D A US174465D A US 174465DA US 174465 A US174465 A US 174465A Authority US United States Prior art keywords vibration circuit current armature instruments Prior art date Legal status (The legal status is an assumption and is not a legal conclusion.

Google Patents US174465A - Improvement in telegraphy

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