a manager is a person who is directing a company.
a telephone operator is a person who answering at the phone.
a switchboard is a device which directs in telephone switchboard.
an adding machine is a clas of mechanical calculator and is used for calculations.
a cd rom is an adaption of the cd which is designed to store computer data.
a printer is an machine which is used to printed the papers.
a laptop is an small computer which is used to provide best practices for mobile application.
