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In U.S. Court of Customs and Patent Appeals, patent appeal No. 3110, in matter of application of Alfred Liebergeld and Fritz Singer, process of producing seamless tubes of iron alloys and the like by extrusion; brief for Commissioner of Patents
| Location | Call # | Status |
|---|---|---|
| Joyner - Microforms B300 | C21.10-293 | ✔ Available |