7910192
 7920192
 7930192
 7940192
 7950192          Instrument out of operation
 7910292
 7920292
 7930292
 7940292
 7950292          1992 Coefficients in use
 7910392
 7920392
 7930392
 7940392
 7950392          1992 Coefficients in use
 7910492
 7920492
 7930492
 7940492
 7950492          1992 Coefficients in use
 7910592
 7920592
 7930592
 7940592
 7950592          1992 Coefficients in use
 7910692
 7920692
 7930692
 7940692
 7950692          1992 Coefficients in use
 7910792
 7920792
 7930792
 7940792
 7950792          1992 Coefficients in use
 7910892
 7920892
 7930892
 7940892
 7950892          1992 Coefficients in use
 7910992
 7920992
 7930992
 7940992
 7950992          1992 Coefficients in use
 7911092
 7921092
 7931092
 7941092
 7951092          1992 Coefficients in use
 7911192
 7921192
 7931192
 7941192
 7951192          1992 Coefficients in use
 7911292
 7921292
 7931292
 7941292
 7951292          1992 Coefficients in use