Subclass Subgroup Patent
G01R 1/06788 12169210
  1/07357 12169211
  1/07378 12169212
  21/06 12169213
  29/0878 12169214
  31/086 12169215
  31/2607 12169216
  31/2808 12169217
  31/2836 12169218
  31/2862 12169219
  31/287 12169220
  31/3016 12169221
  31/31922 12169222
  31/367 12169223
  31/3835 12169224
  31/389 12169225
  31/52 12169226
  31/56 12169227
  33/093 12169228
  33/30 12169229
  33/383 12169230
  33/5608 12169231