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How did mankind create increasingly precise measurements? How do you make a 1mm ruler with a 1cm ruler? - Quora

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Ultratest 6 In./150mm Rigid Steel Ruler

General 676 Precision 6 Rigid Stainless Steel Rule

General Tools 6 Ridgid 4R Precision Stainless Steel Measuring Rule (General Tools 676)

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Buy General Tools Industrial Flexible Straight Edge Ruler

Picking a Precision Steel Rule