Thanks for posting the page from Kraus' book Joe, much appreciated.
The information is surprisingly sparse, and I'm not sure if the introduction date of May 1918 for the snap-on filter is correct. Other sources claim it was introduced a year earlier, and this makes sense since it would coincide with the first use of the irritant diphenylchloroarsine and other sternutators, which I believe the filter pads inside these attachments were designed to combat.
What really baffles me is that the mask pictured above the GM-18 information looks to me very much like a regular GM-17, again without the spider web lense frames, and not a GM-18
.
The information is surprisingly sparse, and I'm not sure if the introduction date of May 1918 for the snap-on filter is correct. Other sources claim it was introduced a year earlier, and this makes sense since it would coincide with the first use of the irritant diphenylchloroarsine and other sternutators, which I believe the filter pads inside these attachments were designed to combat.
What really baffles me is that the mask pictured above the GM-18 information looks to me very much like a regular GM-17, again without the spider web lense frames, and not a GM-18
.
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