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US Patent: 249,233
Speaking-telephone
Patentee:
Rudolf Eickemeyer (exact or similar names) - Yonkers, NY

USPTO Classifications:
381/180

Tool Categories:
specialty tools : communication apparatus

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
George Narr
Henry Osterheld
Patent Dates:
Applied: Jul. 13, 1881
Granted: Nov. 08, 1881

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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