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US Patent: 21,492
Telegraph Insulator
Patentees:
Moses G. Farmer (exact or similar names) - Salem, Essex County, MA
John M. Batchelder (exact or similar names) - Cambridge, Middlesex County, MA

USPTO Classifications:
174/164, 174/170

Tool Categories:
electrical devices : telegraphic apparatus

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Unknown
Patent Dates:
Granted: Sep. 14, 1858

Patent Pictures:
USPTO (New site tip)
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