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Alternatively a tool is used for pressing small keys.

A computer keyboard distinguishes each physical key from every other and reports all key presses to the controlling software.

The teleprinter, in its more contemporary form, was developed from 1907 to 1910 by American mechanical engineer Charles Krum and his son Howard, with early contributions by electrical engineer Frank Pearne.

Earlier models were developed separately by individuals such as Royal Earl House and Frederick G. Earlier, Herman Hollerith developed the first keypunch devices, which soon evolved to include keys for text and number entry akin to normal typewriters by the 1930s.

Further the keyboard size depends on the extent to which a system is used where a single action is produced by a combination of subsequent or simultaneous keystrokes (with modifier keys, see below), or multiple pressing of a single key. Another factor determining the size of a keyboard is the size and spacing of the keys.