Abandoned Murphy Machinery Escape

Murphy Machinery is an industrial machinery and parts manufacturer. One day i was going to visit this place for my college adventure project. I took lot of photos and also took notes about that place for my project. After few minutes I forget how to come out of that place and the main door was locked when i entered into it. So can you please find the related objects and solve the puzzles to open the main door and escape from the Abandoned Murphy Machinery.