| | Name | Description |
| SK-408 Installation & Maintenance Manual | Provides installation and programming information for the SK-408 hybrid key telephone system. |
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| SK-408 Single Line Telephone Quick Reference Guide | Describes how to use features for a single line telephone on the SK-408 telephone system. |
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| SK-408 Keyset Quick Reference Guide | Describes how to use features from an SK-408 keyset model SK1 Series. |