GB/T 15120.2-1994

GB/Z 17979-2000 Information technology--Guidelines for effective use of optical disk cartridges conforming to GB/T 17234 GB/Z 18390-2001 Information technology--Guidance onmeasurement techniques for 90mm optical disk cartridges GB/Z 18808-2002 Information technology--Technical aspects of 130 mm optical disk cartridge write-once recording format GB/T 1990-1980 The dimension and position of theholes of perforated paper tape for information processing exchange GB/T 2020-1980 Recording magnetic tape with 9 magnetic tracks， 12.7mm width and 32 lines/mm for informationprocessing exchange GB/T 3290-1982 Dimensions and characteristics of magnetic tape reel for information interchange GB/T 3237-1982 Information processing--Cores perforated paper tape for information interchange--Dimensions GB/T 3908-1983 Dimensions of 80 columns punched paper cards for information processing