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  • * [[:Category:CPC_E21B43/16|E21B43/16]] (Enhanced recovery methods for obtaining hydrocarbons): 2 patents * [[:Category:CPC_E21B43/26|E21B43/26]] (by forming crevices or fractures): 2 patents
    4 members (4 subcategories, 0 files) - 09:43, 18 July 2024
  • * [[:Category:CPC_E21B43/16|E21B43/16]] (Enhanced recovery methods for obtaining hydrocarbons): 2 patents * [[:Category:CPC_E21B43/26|E21B43/26]] (by forming crevices or fractures): 2 patents
    3 members (3 subcategories, 0 files) - 09:44, 18 July 2024
  • * [[:Category:CPC_E21B43/16|E21B43/16]] (Enhanced recovery methods for obtaining hydrocarbons): 2 patents * [[:Category:CPC_E21B43/26|E21B43/26]] (by forming crevices or fractures): 2 patents
    3 members (3 subcategories, 0 files) - 09:45, 18 July 2024
  • * [[:Category:CPC_E21B43/116|E21B43/116]] (Gun or shaped-charge perforators): 2 patents * [[:Category:CPC_E21B43/26|E21B43/26]] (by forming crevices or fractures): 2 patents
    1 member (1 subcategory, 0 files) - 06:16, 19 July 2024
  • * [[:Category:CPC_E21B43/11855|E21B43/11855]] (Ignition systems): 1 patents * [[:Category:CPC_E21B43/117|E21B43/117]] (Perforators; Permeators): 1 patents
    6 members (6 subcategories, 0 files) - 06:49, 20 July 2024
  • * [[:Category:CPC_E21B43/117|E21B43/117]] (Perforators; Permeators): 1 patents * [[:Category:CPC_E21B43/26|E21B43/26]] (by forming crevices or fractures): 1 patents
    6 members (6 subcategories, 0 files) - 06:49, 20 July 2024
  • * [[:Category:CPC_E21B43/2607|E21B43/2607]] (by forming crevices or fractures): 1 patents * [[:Category:CPC_E21B43/26|E21B43/26]] (by forming crevices or fractures): 1 patents
    4 members (4 subcategories, 0 files) - 16:13, 19 July 2024
  • * [[:Category:CPC_E21B43/2607|E21B43/2607]] (by forming crevices or fractures): 2 patents * [[:Category:CPC_E21B43/26|E21B43/26]] (by forming crevices or fractures): 2 patents
    4 members (4 subcategories, 0 files) - 16:13, 19 July 2024
  • * [[:Category:CPC_E21B43/128|E21B43/128]] (Methods or apparatus for controlling the flow of the obtained fluid * [[:Category:CPC_E21B43/38|E21B43/38]] (EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABL
    2 members (2 subcategories, 0 files) - 08:47, 19 July 2024
  • [[Category:E21B43/267]] [[Category:E21B43/26]]
    2 KB (316 words) - 07:12, 4 December 2023
  • * [[:Category:CPC_E21B43/261|E21B43/261]] (by forming crevices or fractures) * [[:Category:CPC_E21B43/26|E21B43/26]] (by forming crevices or fractures)
    8 KB (1,077 words) - 16:40, 21 July 2024
  • * [[:Category:CPC_E21B43/2607|E21B43/2607]] (by forming crevices or fractures): 2 patents * [[:Category:CPC_E21B43/26|E21B43/26]] (by forming crevices or fractures): 2 patents
    4 members (4 subcategories, 0 files) - 16:13, 19 July 2024
  • [[Category:E21B43/117]] [[Category:E21B43/26]]
    3 KB (483 words) - 17:19, 7 July 2024
  • * [[:Category:CPC_E21B43/12|E21B43/12]] (Methods or apparatus for controlling the flow of the obtained fluid t * [[:Category:CPC_E21B43/14|E21B43/14]] (EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABL
    2 members (2 subcategories, 0 files) - 08:47, 19 July 2024
  • * [[:Category:CPC_E21B43/117|E21B43/117]] (Perforators; Permeators): 2 patents * [[:Category:CPC_E21B43/1185|E21B43/1185]] (Ignition systems): 2 patents
    9 members (9 subcategories, 0 files) - 06:49, 20 July 2024
  • * [[:Category:CPC_E21B43/2607|E21B43/2607]] (by forming crevices or fractures): 2 patents * [[:Category:CPC_E21B43/26|E21B43/26]] (by forming crevices or fractures): 1 patents
    3 members (3 subcategories, 0 files) - 14:58, 21 July 2024
  • * [[:Category:CPC_E21B43/2607|E21B43/2607]] (by forming crevices or fractures): 4 patents * [[:Category:CPC_E21B43/26|E21B43/26]] (by forming crevices or fractures): 2 patents
    5 members (5 subcategories, 0 files) - 16:13, 19 July 2024
  • [[Category:E21B43/16]] [[Category:E21B43/26]]
    4 KB (492 words) - 04:07, 25 March 2024
  • * [[:Category:CPC_E21B43/26|E21B43/26]] (by forming crevices or fractures): 2 patents * [[:Category:CPC_E21B43/2607|E21B43/2607]] (by forming crevices or fractures): 1 patents
    3 members (3 subcategories, 0 files) - 14:58, 21 July 2024
  • * [[:Category:CPC_E21B43/26|E21B43/26]] (by forming crevices or fractures): 2 patents * [[:Category:CPC_E21B43/2607|E21B43/2607]] (by forming crevices or fractures): 1 patents
    3 members (3 subcategories, 0 files) - 14:58, 21 July 2024

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