# Relationship history for MSHA mine 4600861

Current hierarchy: **Frazier Robert B → Kris Energy Inc → Mine No 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:** P M Charles Coal Company → Mine No 1; 1950-01-01 to 1987-01-07; source msha-controller-operator-history
- **controller_controls_mine:** Massey Energy Company → Mine No 1; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Massey Energy Company → P M Charles Coal Company; 1950-01-01 to 1987-01-07; source msha-controller-operator-history
- **operator_operates_mine:** Southbend Coal Company Inc → Mine No 1; 1987-01-08 to 1989-09-24; source msha-controller-operator-history
- **controller_controls_mine:** Kenneth L  Farley et al → Mine No 1; 1987-01-08 to 1989-09-24; source msha-controller-operator-history
- **controller_controls_operator:** Kenneth L  Farley et al → Southbend Coal Company Inc; 1987-01-08 to 1989-09-24; source msha-controller-operator-history
- **operator_operates_mine:** Kris Energy Inc → Mine No 1; 1989-09-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Frazier Robert B → Mine No 1; 1989-09-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Frazier Robert B → Kris Energy Inc; 1989-09-25 to current/open; source msha-controller-operator-history