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2. Hole punch - Wikipedia

   en.wikipedia.org/wiki/Hole_punch

   A hole punch, also known as hole puncher, or paper puncher, is an office tool that is used to create holes in sheets of paper, often for the purpose of collecting the sheets in a binder or folder (such collected sheets are called loose leaves). A hole punch can also refer to similar tools for other materials, such as leather, cloth, or sheets ...

3. Wheatstone system - Wikipedia

   en.wikipedia.org/wiki/Wheatstone_system

   The paper punches were labelled with numbers: 1 for the top hole of the dot, 2 for the sprocket hole for dot, and 3 for the bottom hole for dot. When a dash was punched, extra hole punches to the right punched a centre hole with number 4 and a bottom hole with number 5. [2] The perforator was introduced in 1867. [6]

4. Keypunch - Wikipedia

   en.wikipedia.org/wiki/Keypunch

   Hollerith's Keyboard Punch.This photo is staged; the keyboard layout is for the Farm card (leftmost column is labeled "Kind of Farm") of an Agricultural Census while the paper under the punch shows the layout of the 1890 Population Census card (the actual 1890 census cards had no printing). [6]

5. Punched tape - Wikipedia

   en.wikipedia.org/wiki/Punched_tape

   The tape punch, rather than punching out the usual round holes, would instead punch little U-shaped cuts in the paper, so that no chad would be produced; the "hole" was still filled with a little paper trap-door. By not fully punching out the hole, the printing on the paper remained intact and legible.

6. Friden Flexowriter - Wikipedia

   en.wikipedia.org/wiki/Friden_Flexowriter

   Eventually, IBM settled on a six-hole encoding, as documented in their automatic justifying typewriter patents filed in 1945. [7] [8] Equipping an electric typewriter with both a paper-tape reader and punch created the basic foundation for what would become the Flexowriter.

7. Tabulating machine - Wikipedia

   en.wikipedia.org/wiki/Tabulating_machine

   The card sat over pools of mercury, pools corresponding to the possible hole positions in the card. When the wires were pressed onto the card, punched holes allowed wires to dip into the mercury pools, making an electrical contact [ 5 ] [ 6 ] that could be used for counting, sorting, and setting off a bell to let the operator know the card had ...