# Relationship history for MSHA mine 0801197

Current hierarchy: **Robert G  Birchfield → Coastal Mining Inc → COASTAL MINING, INC.**

- 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:** Fourlico Inc → COASTAL MINING, INC.; 1992-05-01 to 1997-09-02; source msha-controller-operator-history
- **controller_controls_mine:** Armon  Boonsopon → COASTAL MINING, INC.; 1992-05-01 to 1997-09-02; source msha-controller-operator-history
- **controller_controls_operator:** Armon  Boonsopon → Fourlico Inc; 1992-05-01 to 1997-09-02; source msha-controller-operator-history
- **operator_operates_mine:** Coastal Mining Inc → COASTAL MINING, INC.; 1997-09-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert G  Birchfield → COASTAL MINING, INC.; 1997-09-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert G  Birchfield → Coastal Mining Inc; 1997-09-03 to current/open; source msha-controller-operator-history