Ehrgott, Karl. In Court of Customs and Patent Appeals, patent appeal no. 5109, in re Karl Ehrgott, gas purifier and sterilizer; brief for commissioner of patents.
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Ehrgott, Karl. In Court of Customs and Patent Appeals, patent appeal no. 5109, in re Karl Ehrgott, gas purifier and sterilizer; brief for commissioner of patents.
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Ehrgott, Karl. In Court of Customs and Patent Appeals, patent appeal no. 5109, in re Karl Ehrgott, gas purifier and sterilizer; brief for commissioner of patents.