GAS MASK
This Artifact was used to be able to not breathe in toxic gas that Germany used against the US and the person that built this wonderful thing was John Haldane. These object was used during the 1915 to protect their allies. This gas mask was also harmful because the filter that's in the gas mask releases fiber from the filter. And where this photo is found is on https://en.wikipedia.org/wiki/Gas_mask
THE CANNON
The cannon played a big part in world war 1 because it tuck out enemy's trenches and artillery's batteries. The cannon also tuck out communication lines, the reason why they called the cannon howitzers was because it was taken from Germans. And where i found this is on https://www.britannica.com/technology/Big-Bertha-weapon
Tanks
Tanks play the best role for mobility in the ground and but couldn't get more farther than 4 miles in an hour and it was very so in WW1. Tanks killed 20 million death and they wounded 21 million, The first tank was created on September 6, 1915. I found this photo on https://owlcation.com/humanities/WWI-First-Tank-Versus-Tank-Battle