Bertsch, Heinrich. In Court of Customs and Patent Appeals, patent appeal no. 4217 in re Heinrich Bertsch, process of laundering; brief for commissioner of patents.
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Bertsch, Heinrich. In Court of Customs and Patent Appeals, patent appeal no. 4217 in re Heinrich Bertsch, process of laundering; brief for commissioner of patents.
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Bertsch, Heinrich. In Court of Customs and Patent Appeals, patent appeal no. 4217 in re Heinrich Bertsch, process of laundering; brief for commissioner of patents.