What fire alarm NA is this here?

Fire Alarms
1

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2

I have never encountered this alarm before.

3

That is a System Sensor MASS-ADA.

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4

And also a BG-10 pull station

5

I knew what the pull station was. I have seen BG-10s in buildings plenty of times, but never the NA above.

6

These were System Sensor’s main devices in the mid-90s.

Here is what they sound like:

They have multiple tone selections.

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System sensor MASS and fire lite/notifier bg-10