In dimensioning a drawing, the Numbers placed in the dimension lines represent dimension that are only approximate and do not represent any degree of accuracy unless so stated by the designer.
Is mechanical dimension PCB specification (Fab drawing) available at inspection station under document control?
PC B机械尺寸规格是否按照文件要求在检验站进行管控？
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A dimension specified for a given feature on one level of drawing, (for example, a detail drawing) is not mandatory for that feature at any other level (for example, an assembly drawing).