Among those who found a path first was Dr. Cluny Macpherson, a Newfoundland doctor who devised an early gas mask — known as ...

Edward Kelley was found guilty of conspiring to murder the agents two weeks after he was convicted at a separate trial of ...

A welding helmet with a respirator protects the welder from hot gases ... and other contaminants. A paint respirator or gas masks are common types of respirators that use replaceable cartridges and ...