Phase shifter having differently shaped interactive elements...

Photoemission radiant heater

Pivotable heater

Portable electric heater deenergized by a tip-over responsive ac

Portable electric heater or floor lamp

Portable electric heater with digital display

Portable electric heater with vertical heated air outlet

Portable electric space heater

Portable electric space heater with air cooled outer wall surfac

Portable environmental conditioning device with presence detecto

Portable flue heater to reduce or eliminate downdrafts

Portable hemispheric electric space heater with circumferential

Portable pedestal electric heater

Portable quartz heater

Portable radiant heater with two reflectors

Portable thermal-stratifying space heater and powerplant...