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2. Three-point hitch - Wikipedia

   en.wikipedia.org/wiki/Three-point_hitch

   Ferguson and his colleagues developed several innovations to this device (e.g., the hydraulic lift and depth control) which made the system workable, effective, and desirable. In 1938, after almost two decades of trying to sell Henry Ford on using Ferguson's system on tractors mass-produced by Ford, Ferguson finally convinced Ford.

3. Telescopic cylinder - Wikipedia

   en.wikipedia.org/wiki/Telescopic_cylinder

   Telescopic cylinders are a special design of a hydraulic cylinder or pneumatic cylinder as well as pulley system which provide an exceptionally long output travel from a very compact retracted length. Typically the collapsed length of a telescopic cylinder is 20 to 40% of the fully extended length depending on the number of stages. [1]

4. Position-sensing hydraulic cylinder - Wikipedia

   en.wikipedia.org/wiki/Position-sensing_hydraulic...

   The machining and additional production steps associated with “gun drilling” the piston rod can add cost to the finished cylinder. Magnetostrictive LDTs provide extremely high accuracy, down to one micron. [3] Hydraulic cylinder with a Hall effect sensor mounted along its barrel to sense position of a magnetic piston inside. The sensor is ...

5. Hydraulic seal - Wikipedia

   en.wikipedia.org/wiki/Hydraulic_seal

   Helps prevent contamination from entering the hydraulic system (in conjunction with a wiper seal). [3] [4] Piston seal: Is installed on the piston head. Prevents fluid from crossing the area of the piston head. Ensures that fluid does not leak from the cylinder and adequate pressure is maintained. [5] Wiper seal: Is installed on the outside of ...

6. Driller's depth - Wikipedia

   en.wikipedia.org/wiki/Driller's_depth

   Driller's depth is always recorded, and it constitutes the primary depth system, unless it is later superseded by a more accurate measurement such as the depth from an open- or cased-hole wireline log. Driller's depth should always have 1) a unit of measurement e.g. meter or feet, 2) a datum reference e.g. rig floor.

7. Hydraulic recoil mechanism - Wikipedia

   en.wikipedia.org/wiki/Hydraulic_recoil_mechanism

   [1] The usual recoil system in modern quick-firing guns is the hydro-pneumatic recoil system. In this system, the barrel is mounted on rails on which it can recoil to the rear, and the recoil is taken up by a cylinder which is similar in operation to an automotive gas-charged shock absorber , and is commonly visible as a cylinder mounted ...