# Relationship history for MSHA mine 1201904

Current hierarchy: **MidAmerican Energy Holdings Company → Associates Mining Company → Martin County #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

- **controller_controls_mine:** Siegel John J Jr → Martin County #1; 1981-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** MidAmerican Energy Holdings Company → Martin County #1; 1982-06-08 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Green Bay Fuels Inc → Martin County #1; 1982-11-01 to 1984-02-15; source msha-controller-operator-history
- **controller_controls_operator:** Siegel John J Jr → Green Bay Fuels Inc; 1982-11-01 to 1984-02-15; source msha-controller-operator-history
- **operator_operates_mine:** Seminole Coals Inc → Martin County #1; 1984-02-16 to 1985-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Rich John W (Ky-Tn-In) → Martin County #1; 1984-02-16 to 1986-02-13; source msha-controller-operator-history
- **controller_controls_operator:** Rich John W (Ky-Tn-In) → Seminole Coals Inc; 1984-02-16 to 1985-10-31; source msha-controller-operator-history
- **operator_operates_mine:** Associates Mining Company → Martin County #1; 1985-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** MidAmerican Energy Holdings Company → Associates Mining Company; 1985-11-01 to current/open; source msha-controller-operator-history