Useful thing (Zeug), 68-70, 72-82, 107-110, 352-355, 380-381, 387-389, 422, et passim; totality of, 68-69, 76, 79-82, 103-104, 112, 352, 358, 361, 369; manifold of, 79; context of, 75, 78, 102-103, 109-110, 118, 352, 355, 359, 361, 364, 380; world of, 354, 359, 413. See also innerworldly; handiness; things at hand; within-timeness; world history (BT)