Douglas, Robert. In Court of Customs and Patent Appeals, patent appeal no. 2654, in re Robert Douglas, pectin and process of preparing same; brief for commissioner of patents.
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Douglas, Robert. In Court of Customs and Patent Appeals, patent appeal no. 2654, in re Robert Douglas, pectin and process of preparing same; brief for commissioner of patents.
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Douglas, Robert. In Court of Customs and Patent Appeals, patent appeal no. 2654, in re Robert Douglas, pectin and process of preparing same; brief for commissioner of patents.