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2. Tow hitch - Wikipedia

   en.wikipedia.org/wiki/Tow_hitch

   A receiver hitch can accommodate a variety of different tow hitches when the tow hook/ball may be attached via a receiver tube attached to the tow vehicle. Trailer hitch receiver tubes may be bolted, welded, or integral to the vehicle chassis, and come in various sizes depending on the load they are designed to carry and the country of operation.

3. Loading coil - Wikipedia

   en.wikipedia.org/wiki/Loading_coil

   A common application of loading coils is to improve the voice-frequency amplitude response characteristics of the twisted balanced pairs in a telephone cable. Because twisted pair is a balanced format, half the loading coil must be inserted in each leg of the pair to maintain the balance.

4. Zellweger off-peak - Wikipedia

   en.wikipedia.org/wiki/Zellweger_off-peak

   Zellweger is the brand name of an electric switching device also known as a Ripple Control Receiver used to control off-peak electrical loads such as water heaters by switching these loads OFF over peak energy use times of the day and switching them ON after peak energy use times of the day, hence the term 'off peak' control.

5. Radium release hitch - Wikipedia

   en.wikipedia.org/wiki/Radium_Release_Hitch

   A radium release hitch is a load-releasing hitch using 3:1 mechanical advantage which is used in a two-rope technical rescue system. [1] The Radium Release Hitch allows a load to be transferred from one rope to another and is commonly rigged into the belay line prior to the operation of a two-rope technical rescue system.

6. Drawbar (haulage) - Wikipedia

   en.wikipedia.org/wiki/Drawbar_(haulage)

   A large ballast tractor pulling a load using a drawbar General duty tow hitch from VBG on a truck and a drawbar on a trailer, showing a connected drawbar eye Rockinger drawbar coupling, in which the drawbar eye gets locked. A drawbar is a solid coupling between a hauling vehicle and its hauled load. Drawbars are in common use with rail ...

7. Fifth-wheel coupling - Wikipedia

   en.wikipedia.org/wiki/Fifth-wheel_coupling

   "By this means the major portion of the load on the lorry can be transferred to the rear part of the tractor, and this increases the load on the rear wheels (the drivers) of the latter, and consequently the adhesion." They make the point that "The tractor system, of course, means in effect an articulated six-wheel vehicle".