| Digest Nr | Subject and Author |
 |
| 2020.01.12.02 | FS: 15.5" Regina Discs & Columbia Graphophone, from Pat DeWitt |
| 1998.10.21.08 | Columbia Graphophone Co. and the Gramophone Co., from Mark Chester |
| 1998.10.20.07 | Columbia Graphophone Co. & The Gramophone Co., from Jeffrey Borinsky |
| 1998.10.20.06 | Columbia Graphophone and Orthophonic Credenza, from Mark Chester |
| 1998.10.19.06 | Value of Columbia Graphophone, from Mark Kinsler |
| 1998.10.18.11 | Value of Columbia Graphophone, from Linda Wessels |
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