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While I could put a long explanation of MSA's history here, I think that their own website suffices quite well. 

MSA's early forays into industrial gas masks largely involved modifying or updating surplus military gas masks for factory usage. Small Box Respirator masks, like the CEM and RFK, arguably got the worst end of the bargain in this situation, as they were often reduced to mouthpieces and noseclips, attached to a new industrial filter. Many examples similar to this one have been found, although few are complete with the original box and label.

MSA INDUSTRIALIZED SBR

Later masks like the the Kops-Tissot, Akron-Tissot and Kops-Tissot-Munro were also modified for industrial usage. Shown here is a La France branded AT with an MSA-manufactured filter. MSA often manufactured filters for smaller brands, and it's important to take note of this. 

MSA INDUSTRIALIZED AT

This Kops-Tissot was also retrofitted for industrial use, although for a different company. It uses Kupramite-based filters, and the rare "refrigeration" style filter connection. As Kupramite was invented in 1920, we know that this setup was well post-war, despite using lenses atypical for the KT facepiece.

MSA INDUSTRIALIZED KT

These early masks were followed by the "Burrell" series, which was produced from roughly 1919-1940, ending with the Burrell Diaphragm, which was sold concurrently with the MSA All-Vision. The Burrells have their own page, at the link below.

Regarding nomenclature, researchers should be aware that Burrell Diaphragm masks, and their later counterpart, the All-Vision, were sometimes sold as "All-Service" masks. While not referring to a specific facepiece, this title was used to market MSA masks as being useful in a variety of situations, due to their numerous configurations and filters.

The All-Vision was MSA's first foray into the new-found world of injection molded masks, and was developed sometime in the very late 30's to early 40's. It centered around a modular facepiece that could support the addition of various valve plates, exhale valves in the sides of the mask, or speech diaphragms with relatively low risk of the end user damaging the mask beyond function. 

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PHOTOS ARE COMING

The Clear-Vue followed the All-Vision, and was developed in the 1960's. It's our understanding that the All-Vision continued to be produced into the 1980's, although a large portion of it's sales were taken by the Clear-Vue. The Clear-Vue was used for the M-24 Rocket Mask, and MSA's "Speak-Ezee" masks, which can be found at the link below. 

gasmaskbunker.com (c) Moulage, 2017. Drawings (c) Canis-Infernalis.