BACKGROUND OF THE INVENTION 
     As is known, plant safety is an important factor in any given manufacturing operation. In this connection, and more particularly, importance lies in the knowledge that certain equipment remains in optimal operative condition, irrespective of whether or not certain components are in a repair stage and/or are contemplated for repair. The government, through OSHA, i.e. Occupational Safety &amp; Health Administration, is placing an increasing number of restrictions, throughout industry, to achieve maximum safety for the workman. 
     One particular ground of concern is in connection with heavy machinery, where knowledge of other personnel involved in a repair/maintenance operation, or at least their presence, is known to fellow workers, i.e. where, for example, provision is made for absolute shut-off of particular equipment. 
     DESCRIPTION OF THE INVENTION 
     The invention achieves the latter objective by providing a safety box into which one or more keys are introduced and retained, where access to such is prohibited by a lid/cover which is locked into a closed position. 
     In other words, once a key or keys are placed within the safety box, being viewable through a window, an unauthorized worker cannot remove a key and initiate a repair activity unknown to another in the group. The locked key, for example, could be the sole cause of machine operation. 
     In the event the safety box is at a locked condition, openings are also provided around the peripheral edge of the lid, such evidencing, by a tag, the presence of others on the same project, but, perhaps, not viewable. 
    
    
     DESCRIPTION OF THE FIGURES 
     In any event, a better understanding of the present invention will become more apparent from the following description, taken in conjunction with the accompanying drawing, wherein 
     FIG. 1 is a view in front elevation showing a safety box in accordance with the teachings of the present invention; 
     FIG. 2 is a top plan view of the safety box of FIG. 1, looking downwardly in such figure; 
     FIG. 3 is a view in side elevation, partly broken away, further detailing the safety box herein. 
    
    
     For the purposes of promoting an understanding of the principles of the invention, reference will now be made to the embodiment illustrated in the drawing and specific language will be used to describe the same. It will nevertheless be understood that no limitation of the scope of the invention is thereby intended, such alterations and further modification in the illustrated device, and such further applications of the principles of the invention as illustrated therein being contemplated as would normally occur to one skilled in the art to which the invention relates. 
     DESCRIPTION OF THE PREFERRED EMBODIMENT 
     As a matter of example, and with the considerable usage of heavy equipment at a manufacturing facility, equipment down time is not uncommon, being required for maintenance/repair and/or the like. Difficulty lies, however, in the instance where large machinery if involved, such as that taking a great deal of floor space. Without some sort of safety provision, it is oftentimes difficult to visually notice a repair person, as, by reason of obstructions. 
     OSHA, for example, has developed, and/or is developing and/or is desirous for a provision controlling equipment access. The safety box of the invention satisfies such needs, being in the form of a base 12 to which a hinged lid 15 is secured. 
     In the preferred embodiment, the base 12, in the form of a cavity, contains a series of hooks 14a on an internal support member 14b. The hooks 14a may be straight and angle upwardly, as in FIG. 3, or could be more conventional in configuration. 
     Base 12 and lid 15 each include an outwardly extending flange 12a and 15a, respectively, containing spaced-apart aligned openings 17&#39; (see FIGS. 1 and 2). Centrally disposed projections 12b and 15b, also presenting aligned openings 17c&#39;, form part of the peripheral edges of the base 12 and the lid 15, serving to receive a lock 20 (see FIGS. 1 and 3). 
     The lid 15 presents a see-through window 15c for observing a key or keys K within the safety box. With the lock 20 in position, access to any key K is prohibited, meaning that a supervisor or other responsible person has control of the operation of the equipment under maintenance/repair, i.e. no one else has access to a key or keys which may serve operation purposes and all personnel are accountable (by tags T). 
     Thus, the openings 17&#39; further identify workers on the equipment. In other words, complete operation of the equipment is precluded and, as well, the number of other workers involved at the equipment site is readily known. 
     Thus, when no locks or tags T are visible, the supervisor is aware that the equipment is not involved with a maintenance/repair operation and, accordingly, lock 20 can be released, permiting access to the key K so that complete equipment functioning can be initiated. 
     Thus, and in a direct approach, the safety box of the invention simplifies control of manufacturing equipment, i.e. readily indicates the presence and/or absence of personnel. 
     The safety box described above is susceptible to various changes within the spirit of the invention, including, by way of example, in proportioning; in the location and/or configuration of the see-through window in the lid; the number of corresponding openings in the peripheral edges of the base and the lid; the precise approach of positioning and the type of keys within the box; and, the like. 
     Thus, the preceding should be considered illustrative and not as limiting the scope of the following claims.
A safety box having particular adaptability for use in connection with equipment maintenance and repair, achieving safety during service. The box is defined by a base and a lid, where a locking mechanism prevents access to the contents, as one or more keys, which control equipment functioning. In other words, importance lies in affording safety to personnel with equipment/machinery operation.