| 摘要 |
A bed heater with two spaced, perforated, non-metallic plates between which there is arranged spaced loops of an insulated cover-type resistance heating fuse wire. At least some side area between the plates is open allowing lateral movement of air to prevent overheating. Power is supplied through a parallel SCR and diode circuit controlled by an R-C circuit including a temperature responsive resistor and a light responsive resistor.
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