GOST R 50319-1992 Electromechanical switches for use in electronic equipment Sectional specification for in-line package switches《电子设备在使用的机电式开关 成列直插封装开关分规范》.pdf

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DIN 19052-3-1980 Microfilm technics microfilming of engineering drawings reduction ratios for recording on film 35 mm and reenlargement ratio《缩微照相技术 技术图纸缩微照相 在35mm缩微胶片上录制的缩放比列》.pdf

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