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Molly Koskey, 3rd hour, electric fire alarm
Created by
Molly Koskey
⟶ Updated 13 Feb 2018 ⟶
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Events
first fire alarm was invented
the first call came in through the alarm.
The electric fire alarm was patened
First underground free alarm cable was installed
A few boxed were equipped with light indicators
All boxes were equipped with keyless doors
Periods
Electric fire alarm system
