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| 4-30603 | Oct 1992 | JPX |
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| 5055408 | Higo et al. | Oct 1991 | |
| 5228988 | Sanford et al. | Jul 1993 | |
| 5277871 | Fujii et al. | Jan 1994 |
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| 637124 | Aug 1984 | JPX |
| 735290 | Feb 1988 | JPX |
| Entry |
|---|
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| "Article of Magazine Introducing the Hewlett Packard's Product", Pittsburg Conference at Atlanta, Mar. 1991. |
| "Catalogue", Shimadzu, Feb. 1991. |