Coyne Practical Applied Electricity

Coyne Practical Applied Electricity

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There are manually operated fire alarms and automatic ones; the manual alarms being merely a signal system by which ... To send an alarm from this type of box, the operator opens the door and pulls the hook or crank down as far as it will goanbsp;...

Title:Coyne Practical Applied Electricity
Author:The Technical Staff of the Coyne Electrical School
Publisher: - 1946


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