Owen, Richard Blakelock, b.1889. Patents, trademarks, copyrights, departmental practice. Washington, D. C. New York, N. Y.: [R. B. Owen?]. c1925; Patents & Trademarks; 35 p.: ill. 24 cm.
Owen, Richard Blakelock, b.1889. Patents, trademarks, copyrights, departmental practice. Washington, D. C. New York, N. Y.: [R. B. Owen?]. c1925; Patents & Trademarks; 35 p.: ill. 24 cm.
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