![Chemical development Section [and] Mechanical Research and Development Section; summary of achievements, 1917-1918. ter are interchangeable with oneanother. Army Pacepieces Box j:teapirator. The standard box respirator mask producedby the Gas Pefense](https://c8.alamy.com/comp/2AG27YJ/chemical-development-section-and-mechanical-research-and-development-section-summary-of-achievements-1917-1918-ter-are-interchangeable-with-oneanother-army-pacepieces-box-jteapirator-the-standard-box-respirator-mask-producedby-the-gas-pefense-division-was-modeled-very-closely-afterthe-english-mask-for-this-reason-the-work-of-this-stationon-the-development-of-the-facepiece-consisted-principallyin-improvements-in-the-details-of-construction-and-the-devel-opment-of-a-suitable-mask-fabric-the-problem-of-the-noseclip-spring-and-pad-and-theirlocation-in-the-mask-was-carefully-worked-o-2AG27YJ.jpg "Chemical development Section [and] Mechanical Research and Development Section; summary of achievements, 1917-1918. ter are interchangeable with oneanother. Army Pacepieces Box j:teapirator. The standard box respirator mask producedby the Gas Pefense")
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