A time clock, sometimes known as a clock card machine or punch clock or time recorder, is a mechanical (or electronic) timepiece used to assist in tracking the hours worked by an employee of a company.

History of time clocks

Time clocks in practice

• 
  1940
• 
  1948
• 
  1946
• 
  1973
• 
  1973
• 
  1973

See also

• Cost accounting
• History of accountancy