The given word "NATL BUR STAND TECH REP" is not a word at all. Thus, trying to find antonyms for it is not possible.
However, we can break down this string of letters into smaller, meaningful words - national, bureau, standard, technology, and representative. Once we have these words, we can look for antonyms for each individual word.
For example, antonyms for national could be local, regional, or provincial. Antonyms for bureau could be chaos, disorder, or disorganization. Antonyms for standard could be non-standard or irregular. Antonyms for technology could be low-tech or primitive. Finally, antonyms for representative could be non-representative or atypical.