Measurement of noise emitted by machines; airborne noise emission; enveloping surface method and special reverberation room method; household and similar electrical appliances; particular requirements for washing machines and spin extractors (IEC 60704-2-4:1989); german version HD 423.2.4 S1:1989— 9 стр.
Slide projectors and slides -Slides with scientific and technical content - Original drawings and slides, production, testing, projection conditions— 9 стр.
Slide projectors and slides; projector slides for general use and for theatre projection, nominal sizes, dimensions of masks, picture position and marking— 9 стр.