You asked:

what are levers and linkages

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

  • product
    product
    product

  • property

  • measurable entity

  • retailable device

  • [item with description]

  • result of human ingenuity

  • machine

  • retailable manufactured item

  • object with a height