vintage slide rule being used for calculation top view with some calculations paper |
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| navigate by keyword : brand document gadget electronics multimedia text font diagram label design line lighting drawing advertising presentation writing cash vintage slide rule used calculation technical formula piece paper isolated white symbol solution concept coefficient datum number engineer arithmetic scientist student learn diagonal technology macro multiplication subtraction scale scientific math detail sliderule closeup tool engineering calculate division calculus mechanical precision study retro object science background old ruler education mathematics calculator topp view top calculations |
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| vintage slide rule isolated on white. Symbol for technical calculation |
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