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 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 (note: it's been confirmed that no asbestos is present in the filter). 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 40mm lid and a small rubber seal attached through a string to the filter.The height and weight of the filter vary with the date of production and manufacturer. The production ceased in 1943.
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.