# Relationship history for MSHA mine 4605421

Current hierarchy: **Cortis W  Bailey → Cortis Mining Inc → Mine #1**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Mc Dowell Engineering Company → Mine #1; 1976-10-01 to 1977-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Taliaferro R → Mine #1; 1976-10-01 to 1977-08-31; source msha-controller-operator-history
- **controller_controls_operator:** Taliaferro R → Mc Dowell Engineering Company; 1976-10-01 to 1977-08-31; source msha-controller-operator-history
- **operator_operates_mine:** Tri-Star Mining Company Inc → Mine #1; 1977-09-01 to 1985-04-14; source msha-controller-operator-history
- **controller_controls_mine:** Blankenship Virgus → Mine #1; 1977-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Blankenship Virgus → Tri-Star Mining Company Inc; 1977-09-01 to 1985-04-14; source msha-controller-operator-history
- **operator_operates_mine:** Double S Mining Company → Mine #1; 1985-04-15 to 1987-06-25; source msha-controller-operator-history
- **controller_controls_mine:** Sparks Donald J & Ariland Steele → Mine #1; 1985-04-15 to 1987-06-25; source msha-controller-operator-history
- **controller_controls_operator:** Sparks Donald J & Ariland Steele → Double S Mining Company; 1985-04-15 to 1987-06-25; source msha-controller-operator-history
- **operator_operates_mine:** Real Energy Inc → Mine #1; 1987-06-26 to 1987-10-07; source msha-controller-operator-history
- **controller_controls_mine:** Tosh Charles Iii → Mine #1; 1987-06-26 to 1987-10-07; source msha-controller-operator-history
- **controller_controls_operator:** Tosh Charles Iii → Real Energy Inc; 1987-06-26 to 1987-10-07; source msha-controller-operator-history
- **operator_operates_mine:** Nelson Coal Company Inc → Mine #1; 1987-10-08 to 1990-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Nelson David → Mine #1; 1987-10-08 to 1990-07-31; source msha-controller-operator-history
- **controller_controls_operator:** Nelson David → Nelson Coal Company Inc; 1987-10-08 to 1990-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Harold Carl David → Mine #1; 1988-05-01 to 1990-10-31; source msha-controller-operator-history
- **operator_operates_mine:** Fire Creek Inc → Mine #1; 1990-08-01 to 1990-10-14; source msha-controller-operator-history
- **controller_controls_operator:** Harold Carl David → Fire Creek Inc; 1990-08-01 to 1990-10-14; source msha-controller-operator-history
- **operator_operates_mine:** Silver Fuels Inc → Mine #1; 1990-10-15 to 1991-09-23; source msha-controller-operator-history
- **controller_controls_mine:** Lilly Ronald E → Mine #1; 1990-10-15 to 1991-09-23; source msha-controller-operator-history
- **controller_controls_operator:** Lilly Ronald E → Silver Fuels Inc; 1990-10-15 to 1991-09-23; source msha-controller-operator-history
- **operator_operates_mine:** Cortis Mining Inc → Mine #1; 1991-09-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cortis W  Bailey → Mine #1; 1991-09-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cortis W  Bailey → Cortis Mining Inc; 1991-09-24 to current/open; source msha-controller-operator-history