Subclass	Subgroup	Patent
E21B	7/046	10982489
		10982490
	10/43	10982491
	10/5673	RE048524
	17/07	10982492
	19/00	10982493
		10982494
	19/008	10982495
	19/06	10982496
	19/083	10982497
	21/08	10982498
	29/10	10982499
	33/037	10982500
	33/063	10982501
	33/068	10982502
	33/1246	10982503
	33/134	10982504
	34/06	10982505
	34/066	10982506
	34/10	10982507
	36/003	10982508
	41/0021	10982509
	41/0085	10982510
	43/04	10982511
	43/116	10982512
	43/119	10982513
	43/122	10982514
	43/129	10982515
		10982516
	43/20	10982517
	43/2408	10982518
	43/26	10982519
		10982520
		10982521
		10982522
		10982523
	44/00	10982524
	44/02	10982525
		10982526
	47/009	10982527
	47/01	10982528
	47/0228	10982529
	47/024	10982530
	47/092	10982531
	47/107	10982532
	47/12	10982533
	47/13	10982534
	49/00	10982535
	49/008	10982536
	49/08	10982537
	49/088	10982538
	49/10	10982539
E21C	25/56	10982540
	35/08	10982541
E21D	21/0006	10982542