Position of round slot

Minutes of Proceedings of the Institution of Civil Engineers true position of a slot Combining the IT grade number and the tolerance position letter establishes the tolerance symbol, which identifies the actual upper and lower limits of a part true slot wallet Once the feature control frame is assigned, an imaginary tolerance zone is defined and located about true position The datum features are identified by datum

true illusions slot What is ,whether it is a slot or rib or something else?? If you can't explain it simply, then you don't understand it well enough