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2. Diameter at breast height - Wikipedia

   en.wikipedia.org/wiki/Diameter_at_breast_height

   Diameter at breast height, or DBH, is a standard method of expressing the diameter of the trunk or bole of a standing tree. DBH is one of the most common dendrometric measurements. Electronic calipers can measure diameter at breast height and send measured data via Bluetooth to a field computer .

3. Treadmill - Wikipedia

   en.wikipedia.org/wiki/Treadmill

   With some weight relief, sprinters reach temporary speeds of up to 45 km/h (28 mph) and must therefore run on a large deck of up to 300 cm (120 in) in length and up to 100 cm (39 in) in width. With high physical exertion and an increased risk of falling, a fall-stop unit is required to prevent the subject or patient from falling.

4. 10 Hard-Working Treadmills That Also Look Great in Your Home

   www.aol.com/buying-treadmill-shop-top-10...

   Check your ceiling clearance by adding 15 inches to your body height. So, if you are 6’0”, you need at least a 7’3” ceiling. Behind the treadmill there should be at least three feet of ...

5. Unit of length - Wikipedia

   en.wikipedia.org/wiki/Unit_of_length

   The basic unit of length in the imperial and U.S. customary systems is the yard, defined as exactly 0.9144 m by international treaty in 1959. [2] [5] Common imperial units and U.S. customary units of length include: [6] thou or mil (1 ⁄ 1000 of an inch) inch (25.4 mm) foot (12 inches, 0.3048 m) yard (3 feet, 0.9144 m)

6. Rack unit - Wikipedia

   en.wikipedia.org/wiki/Rack_unit

   Rack with sample component sizes including an A/V half-rack unit. A rack unit (abbreviated U or RU) is a unit of measure defined as 1 + 3 ⁄ 4 inches (44.45 mm). [1] [2] It is most frequently used as a measurement of the overall height of 19-inch and 23-inch rack frames, as well as the height of equipment that mounts in these frames, whereby the height of the frame or equipment is expressed ...

7. United States customary units - Wikipedia

   en.wikipedia.org/wiki/United_States_customary_units

   For measuring length, the U.S. customary system uses the inch, foot, yard, and mile, which are the only four customary length measurements in everyday use. From 1893, the foot was legally defined as exactly 1200 ⁄ 3937 m (approximately 0.304 8006 m). [13] Since July 1, 1959, the units of length have been defined on the basis of 1 yd = 0.9144 ...