Combined locking and unlocking nut for ground jointed glassware
FIG. 1 is a side elevational view of a combined locking and unlocking nut for ground jointed glassware, showing my new design. 
     FIG. 2 is a front elevational view of the nut in FIG. 1. 
     FIG. 3 is a cross-sectional view taken along Line III--III of FIG. 2. 
     FIG. 4 is a top plan view of the nut in FIG. 1. 
     FIG. 5 is a bottom plan view of the nut in FIG. 2. 
     FIG. 6 is a bottom perspective view of the nut in FIG. 2.