Embodiments of the present invention generally provide methods systems and articles of manufacture for query processing and for constructing a database abstraction model over an underlying physical database. The database abstraction model allows users to compose an abstract query using a logical view of data, instead of using the view of the underlying database architecture. Embodiments of the invention constrain the results returned from processing an abstract query according to relationships t...

A marker for delineating boundary and playing lines on an athletic field or the like comprises a hollow elongated keystone shaped body member having converging side walls and an open top face with a clearly colored cushioning member in the upper portion thereof and exposed at the top face so that the body member may be embedded in the ground with the cushioning member exposed at ground level.

A game comprising a ball field and playing apparatus, the ball field comprising a substantially flat surface having three playing zones, lines delineating a starting point for a pair of offensive team runners, first and second circles disposed in the first zone for defensive team members, base pads disposed in the first zone, lines delineating first and second safety lanes, respectively, the first and second bases being at the juncture of the first and second zones, a third circle disposed in th...

Four or more cultivator arms or shanks are pivoted to the front and rear of a main frame and are interconnected by linkage so that if a cultivator blade on one arm strikes an obstruction, then it moves rearwardly to clear same and at the same time the others that are interconnected, move forwardly by a lesser amount thus absorbing the movement of the cultivator blade striking the obstruction. When the obstruction is passed, the engagement of the remaining blades with the ground, returns them to ...

A field is marked with first and second spaced generally parallel lines of equal length having spaced opposite first and second ends and twelve player positions marked thereon. First and second leader positions are marked on a central line equidistant from the ends of the line and extending perpendicular thereto. The first leader position is considerably closer to the second line than the first line and the second leader position is considerably closer to the first line than the second line. A p...

1. A missile fusing system of the quasi-stationary field type, said system comprising in combination: an explosive missile having a case; two electrodes each extending through and insulated from the case of said missile and located at diametrically opposed positions around the periphery of said case; neutralizing means for reducing the free space transfer capacitance between said electrodes in order to make the increase in transfer capacitance between said electrodes, as said missile approaches ...

A field chopper, having a chopper drum or reel rotatable on the chassis and a plurality of feed rollers for advancing the crop material to the chopper drum, is provided with a pair of arms flanking the drum and swingable about the axis thereof. The arms each carry a pivotal compensating bar, a pair of pressing rollers being journaled on these arms and being driven by gears meshing with a central pinion whose shaft forms the axis of one of the bars and is, in turn, driven by a transmission. The p...

A field sensor control mechanism for doors and the like has two or more insulated electrodes mounted at different levels in the leading edge of a door or the like. A first oscillating circuit is connected with one of these electrodes and a second oscillating circuit, separate from the first one and serving as a comparison circuit for the same, is connected to the other electrode. The two circuits have base oscillating frequencies which are either identical or differ only slightly from one anothe...

A game involving players of two opposing teams, each of said players positioned on a zone on a playing field, which field has a plurality of concentric circles intersected by perpendicular lines through the center thereof forming four quarters, the outermost zone being a safety ring, the next adjacent being a back ring, the next adjacent being a pivot ring, the next adjacent being a core ring, the next adjacent being a guard ring within which is centrally located a point ring. The game is played...

A support device for a field winding of a field spider includes first and second support members which bear at least partially against free coil surfaces of adjacent field coils. The first and second support members mutually support one another against the field coils with various devices provided to urge the first and second support members apart. The support members may either be angled or flat with the flat support members crossing one another.