AECMA PREN 3057-1987 Aerospace Series Bearings-Airframe Rolling Rigid Two Row Ball Bearings in Steel Cadmium Plated Dimensions and Loads Issue P 1《航空航天系列飞机机架滚动轴承　镀镉钢制固定双列滚珠轴承　尺寸和负荷.pdf

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