1. Get background information first. Start here:
Wikipedia Try WWI technology
Click the hamburger, then All Titles, then look for these titles: An Uncommon History of Common Things,
The Big Idea: How Breakthroughs of the Past Shape the Future,
Encyclopedia of 20th Century Technology,
Oxford Encyclopedia of the History of American Science, Medicine, and Technology
Other Research Databases:
Ebsco databases Use keywords "artificial limbs" and "world war I"