Model：1640
Brand：
| model | 1640 |
|---|
| d | 22.225 |
|---|---|
| D | 50.8 |
| B open | 14.288 |
| B dust cap | 14.288 |
| r min. | 1 |
| Cr | 14000 |
|---|---|
| Cor | 7850 |
| Approx |
|---|
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