158A Backboard
By Bill Lewis, ; posted November 27, 2002; hits 3644
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| Test line phone from a central office. Backboard is marked 158A. For what purpose was such a backboard normally used? |
By Bill Lewis, ; posted November 27, 2002; hits 3644
|
| Test line phone from a central office. Backboard is marked 158A. For what purpose was such a backboard normally used? |