i know for sure 928 is an arizona zip code in or close by yuma az
928 refers to the purity of the metal used to make jewellery.
Any number at all can be divided by 928. There's no particular reasonwhy any particular number should be, any more than any other number.
There is a backhoe trainer in arizona. Call (928)636-5589 The number for backhoe training has changed to (928)460-0913
928-find out ur self
If you mean number its 920-928-3717
928 (116 x 8)