Keywords:
Office machines, Typewriters, Sound intensity, Data processing equipment, Computer hardware, Computer peripheral equipment, Printing machines, Microform readers, Punched card equipment, Type testing, Display devices (computers), Testing conditions, Computer printers, Error correction, Computers, Test equipment, Calibration, Mathematical calculations, Computer storage devices, Teleprinters, Computer terminals, Duplicating machines, Punched card readers, Keyboards, Acoustic testing, Installation, Acoustic measurement, Office equipment, Noise (environmental), Accuracy