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2. L. S. Starrett Company - Wikipedia

   en.wikipedia.org/wiki/L._S._Starrett_Company

   In 1890, L.S. Starrett patented a micrometer with other improvements, transforming the rough version of this tool into a modern micrometer. [5] During the same year Starrett began making and refining saw blades, and continues to be a major manufacturer as of 2015. [citation needed] In 1895 Starrett patented the divider with trammel. [6]

3. Micrometer (device) - Wikipedia

   en.wikipedia.org/wiki/Micrometer_(device)

   The measurement is 4.140 ± 0.005 mm. Micrometers use the screw to transform small distances [9] (that are too small to measure directly) into large rotations of the screw that are big enough to read from a scale. The accuracy of a micrometer derives from the accuracy of the thread-forms that are central to the core of its design.

4. Template:Convert/list of units/length/short list - Wikipedia

   en.wikipedia.org/wiki/Template:Convert/list_of...

   foot: ft (foot) ft long code "foot" outputs foot (and never feet) Use of ′ and ″ symbols violates MOSNUM so is not provided. 1.0 ft (0.30 m) ftin (feet and inches) ft m (foot m) inch: in in Use of ′ and ″ symbols violates MOSNUM so is not provided. 1.0 in (25 mm) in cm; in mm; Other: nautical mile: nmi nmi the international standard ...

5. Calipers - Wikipedia

   en.wikipedia.org/wiki/Calipers

   [4] [5] Although rare finds, calipers remained in use by the Greeks and Romans. [5] [6] A bronze caliper, dating from 9 AD, was used for minute measurements during the Chinese Xin dynasty. The caliper had an inscription stating that it was "made on the gui-you day, [a] the first day [b] of the first month of the first year of Shijianguo.

6. Combination square - Wikipedia

   en.wikipedia.org/wiki/Combination_square

   [4] [2] The standard or square head has three adjacent flat faces, two of them meet square to one another, and the third face is angled away at 45°. When attached one face is parallel to the rule, one face is perpendicular, and one face is at 45°. The standard head usually incorporates a small spirit level and a small removable scriber. [4]

7. Orders of magnitude (length) - Wikipedia

   en.wikipedia.org/wiki/Orders_of_magnitude_(length)

   1.435 m – standard gauge of railway track used by about 60% of railways in the world = 4 ft 8 1 ⁄ 2 in 2.5 m – distance from the floor to the ceiling in an average residential house [ 119 ] 2.7 m – length of the Starr Bumble Bee II , the smallest plane