Ackerman, William. In Court of Customs and Patent Appeals, patent appeal no. 3194, in re William Ackerman, perforating machine; brief for commissioner of patents.
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Ackerman, William. In Court of Customs and Patent Appeals, patent appeal no. 3194, in re William Ackerman, perforating machine; brief for commissioner of patents.
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Ackerman, William. In Court of Customs and Patent Appeals, patent appeal no. 3194, in re William Ackerman, perforating machine; brief for commissioner of patents.