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Circuit diagram of a thyristor controller
Circuit diagram of a thyristor controller to be used in emergency lighting. Drawing no. 86/60/230.
Plan of Vestry Hall, City Road
A plan of Vestry Hall, City Road at 1/4 scale.
Circuit diagram of a thyristor charger
Circuit diagram of a thyristor charger to be used in emergency lighting. Drawing no. 86/60/500.