IBM 6223 User Manual page 14

For example, if a caution statement begins with a number 1, translations for that
caution statement appear in the IBM Safety Information document under statement
1.
Be sure to read all caution and danger statements in this documentation before
performing the instructions. Read any additional safety information that comes with
your computer or optional device before you install the device.
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IntelliStation Z Pro Type 6223: User's Guide