Subclass | Subgroup | Patent |
E21B | 7/06 | 12168930 |
17/03 | 12168907 | |
33/0355 | 12168908 | |
33/04 | 12168909 | |
33/134 | 12168910 | |
34/10 | 12168911 | |
12168912 | ||
37/06 | 12168913 | |
12168914 | ||
41/0085 | 12168915 | |
43/1185 | 12168916 | |
43/127 | 12168917 | |
43/128 | 12168918 | |
43/16 | 12168919 | |
12168920 | ||
12168921 | ||
43/267 | 12168922 | |
44/00 | 12168923 | |
44/02 | 12168924 | |
47/0228 | 12168925 | |
47/024 | 12168926 | |
47/09 | 12168927 | |
47/135 | 12168928 | |
49/08 | 12168929 |