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Tip openings are measured in either hundredths of a millimeter e. g. 1. 47mm or thousandths of an inch e. g. in Wagner operas, and Mahler or Rachmaninov symphonies; this music also tends to be written in bass clef however not forever e. g. Ravel's La Valse. Apparently, bass clarinets in A were once produced by German and French makers, although the historical record is not particularly clear just where and when such production started and ceased. Until the last half of the twentieth century, no new bass clarinets pitched in A were produced.