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| US4618523 | 3 Oct 1985 | 21 Oct 1986 | Kabushiki Gaisha Waizen | Forming a simulated halftone picture | | US5015312 | 27 Dic 1988 | 14 May 1991 | | Method and apparatus for constructing a three-dimensional surface of predetermined shape and color | | US5637175 | 7 Oct 1994 | 10 Jun 1997 | Helisys Corporation | Apparatus for forming an integral object from laminations | | US5730817 | 22 Abr 1996 | 24 Mar 1998 | Helisys, Inc. | Laminated object manufacturing system |
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