Electrical heater

Details Electrical heater Electrical heater

E - Fixed Constructions

21

B

E21B 43/24 (2006.01) E21B 36/04 (2006.01)

Patent

CA 2264354

A heater is disclosed which comprises an electrical insulating material surrounding an annular heating element configuration; wherein there is no casing surrounding an annular heating element configuration.

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