PPT-1617 Napier’s Bones 1623

Schickards mechanical calculator 1664 Cups amp String 1802 Typewriter 1622 Oughtreds Slide Rule 1640 Pascals Calculator 1792 Optical Telegraph 1600 1800 1700 1821

1994 1993 1954 1999 1993 1994 1999 1954 1998 1996 1997 computer radio telegraph 1920 1995 1939 1971 machine

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