US Army became the largest user of gas masks just before the American entry into the First World War. You can find Israeli Gas Mask (Adult) with 40mm Type 80 Filter (Model 4A1) online
After the attacks in France, there is no way a modern fighting force to be deployed against the Germans without the best equipment available to protect them from poisonous gas attacks.
Plants were churning out small amounts of gas masks for firefighters suddenly got a big order to fill in for American soldiers and their allies.
Money came pouring into the industry that mushroomed overnight into a large business enterprise. very minute production began in earnest in the existing model, tweaked to ensure their usefulness to the chemicals that are known from the time, the research and development team went to work to improve the initial design.
British first built a respirator carbon monoxide used during World War One before the first use of chemical weapons by the Germans. Scientists have discovered that the enemy shells exploded giving off a very high level of carbon monoxide gas.
This level is found high enough to kill soldiers within 100 yards of the device unexploded in the trenches, foxholes and small, protected area another patron in which carbon monoxide can concentrate further. The effect is similar to car exhaust when the car is left running in a closed garage.
It was a Canadian who designed a "smoke helmet" with a single blowing tube filled with a chemical solvent to neutralize chlorine gas used in attacks.
Using this design, smoke helmet adapted by allied forces and is widely regarded as the first mass-produced gas masks used to be used against Germany. Germany responded with a gas mask (to be used by their forces against the possibility of a shift in the wind is blowing the chemicals themselves back on them) were employed drum air filter screwed onto the front of the respirator that can be changed easily and quickly to keep the filtration system fresh for several attacks , The British retaliated with SBR or Small Box gas mask respirators become the most widely used during the war.