Vector hand drawn illustration of slide rules types. Circular slipstick, cylindrical Thacher, standart Linear rule and in pocket watch form with spiral scale. Isolated on white background. premium vector by suricoma

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vector number circle illustration isolated form technology old retro vintage Hand instrument tool scale drawing spiral science sketch engineering history old fashioned engineer ruler disc drawn slide mathematical Linear mathematic Sketching calculation rule arithmetic logarithm slide rule engraving cylindrical etching standart duplex simplex slipstick side view pocket watch thacher two cursor

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