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8-268280 | Oct 1996 | JPX | |
9-150791 | Jun 1997 | JPX |
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1750009 | Jensen | Mar 1930 | |
1944725 | Tenny | Jan 1934 | |
2019878 | Tolerton | Nov 1935 | |
2112473 | Tolerton | Mar 1938 | |
4239944 | Obara et al. | Dec 1980 | |
5511131 | Kohara et al. | Apr 1996 | |
5619019 | Yoshimura et al. | Apr 1997 | |
5790682 | Hachiya et al. | Aug 1998 |
Number | Date | Country |
---|---|---|
60-200700 | Oct 1985 | JPX |
5103395 | Apr 1993 | JPX |
Entry |
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K. Satoh et al., IEEE Transactions on Consumer Electronics, vol. 43, No. 3, pp. 972-979, 1997, "A High Fidelity Small-Sized Loudspeaker." |