There was lots of technology that was developed and had a major impact on World war 1
• X-Ray machine : Doctor's treating soldiers were now able to fully see what was wromg with a soldier beyond what the eye showed
• Satellite communication : Made it possible for soilders and captain's to quickly communicate with other army officials
Dont know if this counts but some weapons-
• Flamethrower : They were able to use fire as a weapon
• Machine gun : The design became more advanced