Tandem offices were shaken, but no one was badly hurt on site.
2.
In modern times only the terms Class 4 and Class 5 are much used, as any tandem office is referred to as a Class 4.
3.
In modern times, only the terms Class-4 and Class-5 are much used, as any tandem office is referred to as a Class 4 system.
4.
The "'AT & T Madison Complex Tandem Office "'is a 17-story, skyscraper in Los Angeles, California, completed in 1961.
5.
Various types of test lines were called " 100 ", " 102 ", " 104 " etc . because these numbers accessed the test line in tandem offices in lieu of an area code.
6.
When queried, AMAT sent a high-current pulse through the wire for that particular line, inducing pulses in the appropriate rings which were amplified by a cold cathode tube amplifier and then by a relay, and sent back to the transverter which supplied it to the sender for transmission by ANI to the tandem office.
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