Before revision: Electromechanical bells have been widely used at railroad crossings , in telephones, fire and burglar alarms, as school bells, doorbells, and alarms in industrial plants, since the late 1800s, but they are now being widely replaced with electronic sounders.
After revision: Electromechanical bells have been widely used at level crossing|railroad crossings , in telephones, fire and burglar alarms, as school bells, doorbells, and alarms in industrial plants, since the late 1800s, but they are now being widely replaced with electronic sounders.