PTC heating device having selectively variable temperature level

PTC Heating element

PTC heating element

PTC heating unit suitable for use in motor vehicles

PTC heating unit suitable for use in motor vehicles

PTC heating wire

PTC Honeycomb heating element with multiple electrode layers

PTC planar heater and method for adjusting the resistance of the

PTC resistance heater

PTC thermistor

PTC thermistor controlled electric diesel fuel heater

PTC thermistor elements and heating devices incorporating same

PTC thermistor heating device

PTC-element, protective device and electric circuit board

Pulsating hot-air heat-up system

Pulse electrothermal and heat-storage ice detachment...

Pulse frequency modulation control for a heater

Pulse width modulated defroster

Pulse width modulated defroster

Pulse width modulation of printhead voltage