A deployable fire hose stand designed for the Longmont Fire Department and a heat-resistant mask designed to protect firefighters and fire victims from poisonous fumes will be among more than 90 student inventions showcased at the University of Colorado Boulder’s Engineering Design Expo on Saturday, April 26. The event, which is free and open to the public, will feature a wide range of student-built devices including adaptive technology for people with disabilities, Rube Goldberg machines and even hovercrafts.