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US Patent: 416,873
Cutting Metals by Electricity
Patentee:
Benjamin C. Tilghman (exact or similar names) - Philadelphia, PA

USPTO Classifications:
219/50, 219/68, 451/53

Tool Categories:
metalworking machines : electrical discharge machining

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Unknown

Patent Dates:
Applied: Jul. 27, 1889
Granted: Dec. 10, 1889

Patent Pictures:
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