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drawbar pin hole

Tractor — This article is about a vehicle used in agriculture or construction. For the power unit of a semi trailer truck (articulated lorry), see tractor unit. For other uses, see Tractor (disambiguation) … Wikipedia
Tow hitch — A tow hitch (or tow bar) is a device attached to the chassis of a vehicle for towing or a towbar to an aircraft nose gear, or paired main gears.It can take the form of a tow ball to allow and articulation of a trailer, or a tow pin and jaw with a … Wikipedia
Coupling (railway) — Knuckle (AAR Type E ) couplers in use ICE coupler A c … Wikipedia
Collet — For other uses, see Collet (disambiguation). Collets A collet ( / … Wikipedia