This article or section is currently under construction and is in an unfinished state. Interwar industrial facepiece lacking the kit's register number on its right side Doctrine It is also referred to as Sacic incorrectly, as it is a different company located in Belgium) ( Stabilimento Industria Gomma Lavorazione Affini, Industrial plant for processing rubber and related. ( Industrie Articoli Caucciù, rubber items industries) The T.35 was produced by various companies for multiple years. Post-War Pirelli masks also sport an ENPI logo on the right side and occasionally have an internal marking with the year of production. On the right of the mask, there is the kit's register number (lacking on industrial facepieces), on the inside, usually under the right eyepiece, there is the mould's number, and on the exhale valve there's the producer's logo. Some other variants have dots after their name, but it's not known whether they follow a similar logic or a different one. On the left side of the mask, besides the mask name and the size, there is the company's marking and sometimes a series of dots of varying meaning, with regular non-post-War T.35 following the same logic as M.31-33 masks: the dots indicated the year of production, following the logic of mask name's year (1935 in this case) + the number of dots (which could also not be there, meaning the mask was made in that exact year). IAC T.35 masks, from left to right, size 1, 2 and 3 Markings The anti-fogging lenses are kept tightly onto the lenses by metal inserts and, as the name implies, prevent fogging. It is composed of 5 adjustable straps (a top one, two elastic temple ones and two elastic cheek ones) attached to the facepiece, they gather into a nape pad. The elastic harness has the goal to keep the mask tightly onto the face. The glasses are affixed to the mask through aluminium frames. This kind of glass prevents poisoned air to get into the mask even after being hit, as only the outside layer of glass would be shattered and the other two layers would maintain the seal. The eyepieces are made of "Triplex" glass, which itself is composed of two glass layers and a thin sheet of cellulose. It can be easily inspected and possibly replaced by unscrewing the lid of its housing. It's a single piece made of rubber, it's composed of a base rubber ring which serves as a sealing surface with the housing and the lid connected to it is the tulip-style valve, composed of two discs: it opens under the light pressure of exhaling and closes hermetically under the negative pressure produced by the inhalation. The exhale valve piece allows exhaled air to go outside and prevents poisoned air to get in. Said rubber valve is housed in the metal DIN threaded piece. The inlet valve allows filtered air in from the filter and does not allow exhaled air to go back out from the filter again. the metal threaded piece that allows the filter to be screwed in and houses the inlet valve (inlet).
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