# Relationship history for MSHA mine 3605647

Current hierarchy: **Percival John P & Robert H Hurrle → Sullivan County Mining Company Inc → Pigeon Creek Strip Mine**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Leroy Excavating Company → Pigeon Creek Strip Mine; 1975-06-13 to 1975-12-01; source msha-controller-operator-history
- **controller_controls_mine:** Percival John S & Floyd Schrader → Pigeon Creek Strip Mine; 1975-06-13 to 1975-12-01; source msha-controller-operator-history
- **controller_controls_operator:** Percival John S & Floyd Schrader → Leroy Excavating Company; 1975-06-13 to 1975-12-01; source msha-controller-operator-history
- **controller_controls_mine:** Norma  Percival → Pigeon Creek Strip Mine; 1975-11-16 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Falcon Coal & Construction Company Inc → Pigeon Creek Strip Mine; 1975-12-02 to 1981-05-18; source msha-controller-operator-history
- **controller_controls_operator:** Norma  Percival → Falcon Coal & Construction Company Inc; 1975-12-02 to 1981-05-18; source msha-controller-operator-history
- **operator_operates_mine:** Sullivan County Mining Company Inc → Pigeon Creek Strip Mine; 1981-05-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Percival John P & Robert H Hurrle Et Al → Pigeon Creek Strip Mine; 1981-05-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Percival John P & Robert H Hurrle Et Al → Sullivan County Mining Company Inc; 1981-05-19 to current/open; source msha-controller-operator-history