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The T.35 filter was the standard small filter of the Italian army during the Second World War.
The T.35 filter was a brown-painted metal box containing a layer of particulate filtering material with woven asbestos at the bottom and a layer of activated charcoal and other blocking substances at the top. Before being opened, the bottom intake is covered by a small sheet of waxed canvas and the top is closed using a 40 mm lid, with all of this bound with a string closed using a small lead seal. After the filter have been opened for the first time, it could be closed again using the 40 mm lid and a small rubber seal attached through a string to the filter.
The T.35 filter has three main markings:
- The two symbols on the top near the filter thread are the manufacturer's logos.
- The inscription on the side is the name of the filter. Note that the font changes between some companies.
- The inscription at the bottom is the date of production.