Patent Drawing Symbols for Draftsmen
Copyright: USPTO – Patent Drawing Symbols
Graphical symbols for conventional elements may be used on the drawing when appropriate, subject to approval by the Office.
NOTES: In general, in lieu of a symbol, a conventional element, combination, or circuit may be shown by an appropriately labeled rectangle, square, or circle; abbreviations should not be used unless their meaning is evident and not confusing with the abbreviations used in the suggested symbols.
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