| # | Name | Location | Applications |
|---|---|---|---|
| 1. | J. W. Spenceley | π¨π¦ Lethbridge, Canada | 1 |
| 2. | J.W. SPEAKER CORPORATION | πΊπΈ GERMANTOWN, WI, United States | 24 |
| 3. | JWS TECHNOLOGY CO., LTD. | πΉπΌ New Taipei City, Taiwan | 1 |
| 4. | JWS TECHNOLOGY CO., LTD. | πΉπΌ New Taipei, Taiwan | 1 |