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The need for which natural resource provided the incentive for sub-Saharan Africans to undertake trade?
Technical Drawing
A precise and detailed form of drawing used to fully and clearly define requirements for engineered items.
Permissible Variation
The degree to which a value or dimension may vary without affecting the operation or purpose of a component or system.
Technical Drawing
A precise and detailed drawing, usually created by draftsmen or engineers, used to fully and clearly define requirements for engineered items.
Symbol
A graphical element used on drawings or in documentation to represent a specific concept, operation, or component without the need for textual explanation.
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