A detector detector of explosive or toxic gases, free, in closed premises (Machine-translation by Google Translate, not legally binding)

摘要

Improvements introduced in the object of the main Patent No. 280,734 which refers to "a detector device of explosive or toxic gases, free, in closed premises, consisting of the addition to the device object of the same of a piece of permanent magnet inserted in the solid hollow alluded to in the claim of that Patent or in the counterweight also alluded to in the fourth claim thereto, if this modality is used, intended to act on a magnetic alarm signaling contactor. (Machine-translation by Google Translate, not legally binding)