U.S. federal trademark · Serial No. 90481943 · Reg. No. 6655497
safety features for portable propane heaters in the nature of detection systems specially adapted for propane heaters for detecting the presence of oxygen depletion and heater position, sold as a component of propane heaters; safety features for portable propane heaters in the nature of oxygen depletion sensors, tip-switches, cross-thread protection system to prevent unintended sparking, and flame-retardant materials of the propane heater, sold as a component of propane heaters
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