71597970
May 23, 1950
May 22, 1951
ROOM FIRE ALARMS CONSISTING OF A CONTROL UNIT HAVING ELECTRICAL CONTROLS AND AN ALARM OR SOUNDING ELEMENT, AND THERMOSTATS CONTAINING HEAT-SENSITIVE ELEMENTS SO ARRANGES AS TO MAKE ELECTRICAL CONTACT WHEN THE ROOM TEMPERATURE ATTAINS A PREDETERMINED LEVEL, THEREBY SETTING OFF THE ALARM CONTAINED IN THE CONTROL UNIT
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