AT&T 999-507-144 ユーザーズマニュアル

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Write the account numbers next to 3-character dial codes that do  not
already have telephone numbers next to them.
Write the name of the person or organization to identify each account
number.
You should now have a complete set of planning forms. Keep them together
in a safe place until you are ready to install and administer your system.
System Speed Dial Directory      2-19