Thread: smoke alarm with montoring delay
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micky micky is offline
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Default smoke alarm with montoring delay
In alt.home.repair, on Thu, 5 Jul 2018 09:29:08 -0500, Sam E
wrote:

On 07/04/2018 11:04 PM, micky wrote:

[snip]

These were usually 110 VAC.

with a backup battery.

[snip]

The backup battery came later.

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