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Molly Koskey, 3rd hour, electric fire alarm
Creado
Molly Koskey
⟶ Actualizado 13 feb 2018 ⟶
List of edits
Comentarios
Eventos
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
Períodos
Electric fire alarm system