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US Patent: 8,438
Telegraph insulator
Patentee:
John Yandell - St. Louis, MO

USPTO Classifications:
144/250.1, 174/154, 174/45R

Tool Categories:
specialty machines : telegraphy apparatus

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Unknown

Patent Dates:
Granted: Oct. 14, 1851

Patent Pictures:
USPTO pdf tiff
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