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The EM was an Italian gas mask made by Pirelli for industry use.
The mask was issued with a filter that depended on the kind of protection required in the buyer's working condition. The most common filter was the "Tubin", a metal box similar to the one of the Penna.
The mask was used in two configurations. With the first one, the mask came with a satchel similar to the one of the Penna respirator: it had two sections, one for the mask and the other for the filter and hose. The filter section had holes to allow airflow. The main strap had a special buckle to be shortened when the mask was in use; the small string on the side of the satchel helped keeping the aforementioned firmly onto the wearer's chest. In the second configuration, the filter was put in a small cage satchel on the wearer's chest.