Number | Name | Date | Kind |
---|---|---|---|
3486441 | Hillman | Dec 1969 | |
3949667 | Zimmer | Apr 1976 | |
4902371 | Andris | Feb 1990 | |
4919970 | Hoebener | Apr 1990 |
Number | Date | Country |
---|---|---|
234877 | Nov 1985 | JPX |
Entry |
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"Extrusion Printing Apparatus", vol. 6, No. 4, p. 76, Sep. 1963. |