# Relationship history for MSHA mine 1505026

Current hierarchy: **James A  Comyns → P B Coal Company Inc → No 23**

- 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:** Skyline Coal Company → No 23; 1950-01-01 to 1981-07-12; source msha-controller-operator-history
- **controller_controls_mine:** Compton James → No 23; 1950-01-01 to 1981-07-12; source msha-controller-operator-history
- **controller_controls_operator:** Compton James → Skyline Coal Company; 1950-01-01 to 1981-07-12; source msha-controller-operator-history
- **controller_controls_mine:** El Paso Energy Corp → No 23; 1980-10-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Big Pound Coal Company → No 23; 1981-07-13 to 1984-02-20; source msha-controller-operator-history
- **controller_controls_mine:** Blankenship Willie & Danny Hurley Et Al → No 23; 1981-07-13 to 1984-02-20; source msha-controller-operator-history
- **controller_controls_operator:** Blankenship Willie & Danny Hurley Et Al → Big Pound Coal Company; 1981-07-13 to 1984-02-20; source msha-controller-operator-history
- **operator_operates_mine:** Mc Coy Caney Coal Company → No 23; 1984-02-21 to 1984-04-19; source msha-controller-operator-history
- **controller_controls_operator:** El Paso Energy Corp → Mc Coy Caney Coal Company; 1984-02-21 to 1984-04-19; source msha-controller-operator-history
- **operator_operates_mine:** Easy Coal Company Inc → No 23; 1984-04-20 to 1984-11-08; source msha-controller-operator-history
- **controller_controls_mine:** Bolen Aaron Doug → No 23; 1984-04-20 to 1984-11-08; source msha-controller-operator-history
- **controller_controls_operator:** Bolen Aaron Doug → Easy Coal Company Inc; 1984-04-20 to 1984-11-08; source msha-controller-operator-history
- **operator_operates_mine:** Mc Coy Caney Coal Company → No 23; 1984-11-09 to 1986-11-09; source msha-controller-operator-history
- **controller_controls_operator:** El Paso Energy Corp → Mc Coy Caney Coal Company; 1984-11-09 to 1986-11-09; source msha-controller-operator-history
- **operator_operates_mine:** P B Coal Company Inc → No 23; 1986-11-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** James A  Comyns → No 23; 1986-11-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James A  Comyns → P B Coal Company Inc; 1986-11-10 to current/open; source msha-controller-operator-history