U.S. federal trademark · Serial No. 72023373 · Reg. No. 0655788
CARBON MONOXIDE DETECTORS IN THE NATURE OF AN ALARM APPARATUS HAVING A MERCURY COLUMN, THE LEVER WHEREOF IS CONTROLLED BY A CARBON MONOXIDE RESPONSIVE CATALYST AND WHICH, WHEN THE MERCURY RISES TO A PREDETERMINED LEVEL, CLOSES AN ELECTRICAL CIRCUIT TO SOUND AN ALARM
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