| Number | Date | Country | Kind |
|---|---|---|---|
| 2073933 | Apr 1998 | GBX |
| Number | Name | Date | Kind |
|---|---|---|---|
| D254251 | Ward | Feb 1980 | |
| D305892 | Freed | Feb 1990 | |
| D379183 | Lin | May 1997 | |
| D390234 | Ito et al. | Feb 1998 | |
| D392289 | Isonaga | Mar 1998 |
| Number | Date | Country |
|---|---|---|
| VI93 O 0061 | Jun 1993 | ITX |
| Entry |
|---|
| Stereo Review, p. 50, Magnet Speaker, May 1987. |
| Stereo Review, p. 39, OHM CAM 16 Speakers, Apr. 1990. |
| Stereo Review, p. 54, B & W's Matrix 802 Loudspeaker, Aug. 1989. |
| Dalesford D speakers, Hi-Fi For Pleasure, Oct. 1981, p. 202. |
| "Kugellautsprecher!: A German Approach Towards the Omni-Directional Ideal" reproduced from Mar. 1959 issue in Classic Hi-Fi: Hi-Fi News & Record Review, Feb. 1999, pp. 22-24. |
| Cubicon brochure prior to Jun. 1991. |
| JR Loudspeakers, Hi Fi News, Mar. 1978. |