Abstract: A service entrance level includes a generally cylindrical housing that is at least partly sized to mate with an aperture. The generally cylindrical housing includes a planar face and a curved face. One or more level indicators are mounted to the housing, and the one or more level indicators are arranged to indicate the orientation of the housing in at least two axes. An illuminator, coupled to the housing, is arranged to emit a beam in a direction parallel to the curved face of the housing.

Abstract: An agricultural seeding machine movable in a planting direction includes a frame; a disc opener assembly carried by the frame and having a first axis of rotation; a gauge wheel assembly carried by the frame and having a second axis of rotation, and a press wheel assembly carried by the frame and having a third axis of rotation. The second axis is positioned forward of the first axis relative to the planting direction. The gauge wheel assembly overlaps the disc opener assembly relative to the planting direction. The third axis is positioned rearward of the first axis relative to the planting direction. The press wheel assembly overlaps the disc opener assembly relative to the planting direction.

Abstract: An apparatus comprising a rotating substrate holder is provided. The rotating substrate holder is hollow and adapted to receive liquid gas such as nitrogen to cool the substrate to cryogenic temperatures. The novel substrate holder is supported inside of a vacuum chamber by a thin wall tube which is sealed with a liquid rotating seal at the point where it passes completely through the top wall of the vacuum chamber. The novel thin wall tube support provides access to the hollow substrate holder from outside the vacuum chamber and provides temperature isolation of the liquid in the substrate holder so that the liquid rotating seals are maintained at operable elevated temperatures.