标准号:IS 5440-1969
发布日期:1970/4/1 12:00:00
实施日期:1999/12/31 12:00:00
适用范围:This specification covers optical flats made of quartz and glass for use in the standard and inspection laboratories for the determination of flatness and parallelism of precision gauges by examination of interference patterns obtained with a monochromatic light.