Number | Date | Country | Kind |
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53-156152[U] | Nov 1978 | JPX |
Number | Name | Date | Kind |
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3886504 | Hartmann et al. | May 1975 | |
4130813 | Sandy et al. | Dec 1978 |
Entry |
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Sandy et al-"Surface Acoustic Wave Ring Filter", 1976, Ultrasonics Symposium Proceedings, IEEE Cat. No. 76 CH 1120-5 SU, pp. 391-396. |