. >> reporter: mike will hancock and the executive director of the college opened up a time capsule filled and sealed in 1955. it was supposed to be opened in 1995 but we're finally getting a look at its contents now. inside was a letter from the then principal, explaining the training of students for various locations, including denver's martin plant in their industry of guided missiles. an asteroid orbiting the sun. >> you see the type of training we were doing for an industry that was burgeoning at that time. we hadn't put a man on the moon yet. >> reporter: some things are different. but some things haven't changed. a school schedule showed classes for pipe fiters and electricians. >> history 60 years ago is repeating itself and the classes haven't really changed for the skill trades. >> reporter: even the budget for the school will join the exhibit on the 5th floor of the main denver public library on broadway. their total budget in 1955, $51,500. >> the exhibit is free, runs through august. they have provided training to some two million students. discovered a rare dinosaur skull on