| Name | Crystal Radio |
| Model No. | BTH “BIJOU” CRISTAL（BCC No. 861） |
| Country | U.K. |
| Year | Manufactured in 1923 |
| Manufacturer | Manufactured by THE BRITISH THOMSON-HOUSTON Co. Ltd. |
| Notes | Crystal radios could not power a speaker, so listeners heard broadcasts using headphones. |
| Name | Headphones |
| Model No. | BTH Headphones |
| Country | U.K. |
| Year | Manufactured in 1923 |
| Manufacturer | Manufactured by THE BRITISH THOMSON-HOUSTON Co. Ltd. |
| Notes |
The Taizo Arakawa Collection