Section 22
Japan
| Ref. No. | Author | Date | Title |
|---|---|---|---|
| English | NKH | 1995 | NHK Broadcast Museum catalogue |
| Japanese | NKH | 1995 | NKH Broadcast Museum catalogue |
| Japanese | NKH | 1984 | No 29 |
| Japanese | NKH | 1995 | - |
| Japaneser | Antique Wireless Club | 1993 | No 1 |
| Japanese | Antique Wireless Club | 1993 | No 2 |