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| Number | Date | Country |
|---|---|---|
| 33 06 056 | Jun 1984 | DE |
| Entry |
|---|
| Inline Mouse Ramp, Ergonomics and Occupational Health Catalogue, Issue 2, 1997, p. 9. |
| Low Stress, AliMed-Ergonomics Catalogue, 1998, p. 31. |