Heltzel, John N. In Court of Customs and Patent Appeals, patent appeal no. 4759, in re John N. Heltzel, improvement in expansion joint; brief for commissioner of patents.
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Heltzel, John N. In Court of Customs and Patent Appeals, patent appeal no. 4759, in re John N. Heltzel, improvement in expansion joint; brief for commissioner of patents.
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Heltzel, John N. In Court of Customs and Patent Appeals, patent appeal no. 4759, in re John N. Heltzel, improvement in expansion joint; brief for commissioner of patents.