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US Patent: 230,698
Speaking-telephone
Patentee: Rudolf Eickemeyer (exact or similar names) - Yonkers, NY USPTO Classifications: 381/417 Tool Categories: specialty tools : communication apparatus Assignees: None Manufacturer: Not known to have been produced Witnesses: George Narr Henry Osterheld	Patent Dates: Applied: May 10, 1880 Granted: Aug. 03, 1880 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Osterheld & Eickemeyer

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