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"The revision symbol may be used to identify an item or area of change on the drawing. The symbol should be placed at or near the location affected by the change."
"When a revision symbol is used, the revision letter, and the sequence number when used, shall be enclosed in a circle to form a revision symbol."
"On drawings where use of revision symbols may conflict with other symbols used on the drawing creating a possible misinterpretation, the revision description will be adequate."