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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ASTM D3704-1996(2012) Standard Test Method for Wear Preventive Properties of Lubricating Greases Using the (Falex) Block on Ring Test Machine in Oscillating Motion《在摆动运动中使用(法列克司)环和.pdf

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