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Opinion of Thomas Ewing : on the validity of the claims of the American Bell Telephone co., under the patent, to A.G. Bell, of March 7, 1876
- "Opinion of Thomas Ewing : on the validity of the claims of the American Bell Telephone co., under the patent, to A.G. Bell, of March 7, 1876"@en
- "Opinion of Thomas Ewing on the validity of the claims of the American Bell Telephone Co., under the patent, to A.G. Bell, of March 7, 1876"@en
- "Opinion of Thomas Ewing : on the validity of the claims of the American Bell Telephone Co., under the patent, to A.G. Bell, of March 7, 1876"