Punch cards. I spent a lot of time at the keypunch in the early 70s, entering FORTRAN programs. A sampling of card types is shown, along with an aluminum IBM Card Registration Guage and a 129 Card Removal Tool, better known as a card saw. The Aperture Card has an attached strip of microfilm, which in this case is an engineering drawing of a Circuit Card Assembly for some sort of power supply. The blue item is a card weight, and is used in a card reader or sorter to hold the cards down in the input hopper. The cylinder is the program drum from an 029 keypunch, and is used to hold the program card. The two card decks are for the IBM 1401, and play music (Anchors Aweigh, and She'll Be Comin' 'Round the Mountain) on the 1403 line printer. See Ed Thelen's IBM 1401 restoration site for audio files of the 1403 playing music.