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In French-speaking Canada, the U.S. and Australia, "birthday punches" are given in a similar fashion, with the person whose birthday it is being punched a number of times equal to his/her age, often with one additional punch "for luck". [1] In some places, instead of a punch "for luck", the recipient is pinched "to grow an inch".
For US legal paper size (8 + 1 ⁄ 2 by 14 inches, 220 by 360 mm), a 4-hole system exists. It is still in use today, but is not as common as the 3-hole standard. The four holes are positioned symmetrically with centers 3 + 1 ⁄ 2 inches (89 mm) apart. The four binding positions provide more support for the longer 14-inch side of legal paper.
The punch force required to punch a piece of sheet metal can be estimated from the following equation: [4] F = 0.7 t L ( U T S ) {\displaystyle F=0.7tL(UTS)} Where t is the sheet metal thickness, L is the total length sheared (perimeter of the shape), and UTS is the ultimate tensile strength of the material.
A punched card (also punch card [1] or punched-card [2]) is a piece of card stock that stores digital data using punched holes. Punched cards were once common in data processing and the control of automated machines .
A punch (left) and the respective matrix produced from it (right). The small letters at the base of the matrix are founders marks. Punchcutting is a craft used in traditional typography to cut letter punches in steel as the first stage of making metal type. [1]
An IBM 80-column punched card of the type most widely used in the 20th century IBM 1442 card reader/punch for 80 column cards. A computer punched card reader or just computer card reader is a computer input device used to read computer programs in either source or executable form and data from punched cards.
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