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US Patent: 140,905
Improvement in cutter-heads
Patentee:
John F. W. Erdmann (exact or similar names) - Philadelphia, PA

USPTO Classifications:
144/219, 407/40

Tool Categories:
woodworking machines : machine and tool cutters : cutterheads

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Hugh Maxwell
Joseph Subbermann
Patent Dates:
Applied: Oct. 05, 1872
Granted: Jul. 15, 1873

Patent Pictures:
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