Props are the items used to create an environment or setting within which the action of a play takes place. In any play, the props used will be determined by the resources available to the company producing the play, the space available for placement of props on the stage, and the need for items to support the plot. It is not possible to give one all-inclusive list of props that will always be used in the production of any given play.
In the case of Death of a Salesman, props are used first to create the Loman's house. The furniture, pictures on the walls, items scattered about the room(s) are all props contributing to the impression of a family not doing well financially or emotionally. As the play progresses, props support changes in the location of the action from scene to scene.
In the final analysis, the props of any play are dependent upon the imagination of the people producing the play.