# Relationship history for MSHA mine 4601266

Current hierarchy: **Bell Douglas-Casset Bias → Laurel Coal Corp → 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:** Armco Inc → No 1; 1950-01-01 to 1984-02-26; source msha-controller-operator-history
- **controller_controls_mine:** Armco Inc → No 1; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Armco Inc → Armco Inc; 1950-01-01 to 1984-02-26; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → No 1; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Peabody Coal Company → No 1; 1984-02-27 to 1989-03-21; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Peabody Coal Company; 1984-02-27 to 1989-03-21; source msha-controller-operator-history
- **controller_controls_mine:** Bell Douglas-Casset Bias Et Al → No 1; 1987-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Rose Eagle Coal Corp → No 1; 1989-03-22 to 1990-07-24; source msha-controller-operator-history
- **controller_controls_mine:** Meade B J → No 1; 1989-03-22 to 1990-07-24; source msha-controller-operator-history
- **controller_controls_operator:** Meade B J → Rose Eagle Coal Corp; 1989-03-22 to 1990-07-24; source msha-controller-operator-history
- **operator_operates_mine:** Laurel Coal Corp → No 1; 1990-07-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bell Douglas-Casset Bias Et Al → Laurel Coal Corp; 1990-07-25 to current/open; source msha-controller-operator-history