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The M.42 filter was the successor to the T.35 filter and it was used from 1942 until 1958.
Overview EditThe M.42 filter was a brown-painted metal box containing a layer of particulate filtering material and a layer of activated charcoal and other blocking substances at the top. Before being opened, the bottom is covered by a rubber seal and the top is closed using a 40mm lid. After the filter has been opened for the first time, it could be closed again using the 40mm lid and the same rubber seal attached through a string to the filter. The M.42 was a bit lighter and more efficient than the T.35 filter, but it was never issued widely because of monetary constraints in the Italian army.
The M.42 filter has three main markings:
- A the bottom of the filter there is the date of production.
- The two symbols on the top near the filter thread are the manufacturer's logos.
- Near the manufacturer's logos, there is the name of the filter, M.42.
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