Circuit couldn't do any more feedback control of hot wire. Therefore electric current kept 3),Ag of under layered conductor raised effecting foregin substance. flowing to hot wire. And glass-coating of hot wire bubbled and it was broken.
Circuit couldn't do any more feedback control of hot wire. Therefore electric current kept 3),Ag of under layered conductor raised effecting foregin substance.flowing to hot wire. And glass-coating of hot wire bubbled and it was broken.