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The T.35 filter was the standard small filter of the Italian army during the Second World War.
The Dirzepo, a variant of this filter, was identical in every aspect with the exception of colour and markings.
The T.35 filter was a brown-painted metal box containing a layer of particulate filtering material made of resin-impregnated wool and viscose rayon at the bottom and a layer of activated charcoal, pumice 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 has 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.