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W. L. Voelker | lit.salon
W. L. Voelker
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In the United States Patent Office, before the examiner of interferences, Voelker v. Gray, et al., in re., interference cases a, b, c, d, e, f, g, i, j, l, and no. 1 : subject-matter "Telephones."
1885
W. L. Voelker, E. Gray, United States. Patent Office
