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lead diameter mechanism composition variations production date origin |
2 mm pushbutton incremental advance clutch all metal none 1990s to present Italy |
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| special features | lead degree indicator | ||
| see also | Alvin Tech-Matic T4 |
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lead diameter mechanism composition variations production date origin |
2 mm pushbutton spring clutch all metal 1990s to present none Italy |
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| special features | lead degree indicator | ||
| see also | Koh-I-Noor "Super Adapto" 5616 |
 
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