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US Patent: 79,272
Improvement in Instruments for Adding and Registering Numbers
Patentees:
Nelson Spofford (exact or similar names) - Haverhill, MA
Charles Corliss (exact or similar names) - Haverhill, MA

USPTO Classifications:
235/144M, 235/64, 235/65, 235/72

Tool Categories:

Assignees:
Charles Corliss - Haverhill, MA

Manufacturer:
Not known to have been produced

Witnesses:
C. J. Noyes
William E. Blunt

Patent Dates:
Granted: Jun. 23, 1868

Patent Pictures:
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