On the number cards/labels affixed to latter-decades' Bell System phones, there was a letter M stamped like this:
----------------------------- | AREA | | CODE M 555-4321 | | 595 |
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What did the M mean?
On the number cards/labels affixed to latter-decades' Bell System phones, there was a letter M stamped like this:
----------------------------- | AREA | | CODE M 555-4321 | | 595 |
-----------------------------
What did the M mean?
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