vintage slide rule being used for calculation with technical formula |
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| navigate by keyword : font text document line brand handwriting drawing writing diagram sketch label calligraphy design pattern presentation number paper cartoon advertising vintage slide rule used calculation technical formula piece isolated white arithmetic background calculate calculator calculus closeup coefficient concept datum detail diagonal division education engineer engineering learn macro math mathematics mechanical multiplication object old precision retro ruler scale science scientific scientist solution student study subtraction technology tool notebook |
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| vintage slide rule being used for calculation with technical formula on a piece of paper and a notebook |
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