Number | Date | Country | Kind |
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3525977 | Jul 1985 | DEX |
Number | Name | Date | Kind |
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3308119 | Zimmermann | Mar 1967 | |
4199583 | Moon et al. | Apr 1980 |
Number | Date | Country |
---|---|---|
0121082 | Oct 1984 | EPX |
2501769 | Jul 1976 | DEX |
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