| Number | Name | Date | Kind |
|---|---|---|---|
| D234604 | Shimizu | Mar 1975 | |
| D242806 | Stone | Dec 1976 | |
| D249683 | Rams | Sep 1978 | |
| 2787332 | Fulmer | Apr 1957 | |
| 3765504 | Itoh | Oct 1973 |
| Entry |
|---|
| Stereo/Hi-Fi Directory 1963, p. 97, Advanced Acoustics Speaker Enclosure. |
| Lafayette Radio Electronics, No. 750, p. 44, 1975, "Poly-Planar Speakers", Item No. 4. |