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You asked:

what are levers and linkages

  • piece of equipment, product, property, object with a length, retailable device, machine, [item with description], result of human ingenuity, visible object, thing that was created, object with a geographical location, physical object, mechanical system, retailable manufactured item, object with a height, inanimate object, manufactured product, object with a length or height, individual object, object classified by physical property, retail product, object with a mass, multi-part manufactured item, manufactured item and device.
  • piece of equipment
    piece of equipment
    piece of equipment

  • product

  • property

  • object with a length

  • retailable device

  • machine

  • [item with description]

  • result of human ingenuity

  • visible object

  • thing that was created