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US Patent: 333,290
Duplex Telegraphy
Patentee:
Thomas A. Edison (exact or similar names) - Menlo Park, Middlesex County, NJ

USPTO Classifications:
178/47, 178/79

Tool Categories:
electrical devices : telegraphic apparatus

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Unknown
Patent Dates:
Applied: May 08, 1885
Granted: Dec. 29, 1885

Patent Pictures:
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