Elfreth, William Henry. Patents, copyrights, and trade-marks. New York: Baker, Voorhis. 1913; Patents & Trademarks; 261 p., [2] leaves of plates: ill. (1 col.); 21 cm.
Elfreth, William Henry. Patents, copyrights, and trade-marks. New York: Baker, Voorhis. 1913; Patents & Trademarks; 261 p., [2] leaves of plates: ill. (1 col.); 21 cm.
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