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2. Three-point hitch - Wikipedia

   en.wikipedia.org/wiki/Three-point_hitch

   In engineering terms, three-point attachment is the simplest and the only statically determinate way of rigidly joining two bodies. A three-point hitch attaches the implement to the tractor so that the orientation of the implement is fixed with respect to the tractor and the arm position of the hitch.

3. Tow hitch - Wikipedia

   en.wikipedia.org/wiki/Tow_hitch

   A tow hitch (or tow bar or trailer hitch in North America [1]) is a device attached to the chassis of a vehicle for towing, or a towbar to an aircraft nose gear. It can take the form of a tow ball to allow swiveling and articulation of a trailer , or a tow pin, or a tow hook with a trailer loop, often used for large or agricultural vehicles ...

4. Power take-off - Wikipedia

   en.wikipedia.org/wiki/Power_take-off

   A PTO at the rear end of a farm tractor A PTO (in the box at the bottom) in the center of the three-point hitch of a tractor. A power take-off or power takeoff (PTO) is one of several methods for taking power from a power source, such as a running engine, and transmitting it to an application such as an attached implement or separate machine.

5. Tractor - Wikipedia

   en.wikipedia.org/wiki/Tractor

   The first three-point hitches were experimented with in 1917. After Harry Ferguson applied for a British patent for his three-point hitch in 1926, they became popular. A three-point attachment of the implement to the tractor is the simplest and the only statically determinate way of joining two bodies in engineering.

6. ISO standards for trailer connectors - Wikipedia

   en.wikipedia.org/wiki/ISO_standards_for_trailer...

   7-pin ISO 1724 trailer connector type 12N (Towing vehicle side). This connector uses a mix of pin and socket terminals. Physical design according to standard ISO 1724. [4] [8] The 7-pin connector uses all 7 pins on newer trailers according to the ISO standard. [9] [10] On older trailers there's sometimes a 5-wire setup using a 7-pin connector.

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