# Relationship history for MSHA mine 4604596

Current hierarchy: **Stacey Roger L → Solid Energy Inc → Mine #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:** Triple B Coal Inc → Mine #1; 1975-03-01 to 1977-06-20; source msha-controller-operator-history
- **controller_controls_mine:** Blankenship Walter L → Mine #1; 1975-03-01 to 1977-06-20; source msha-controller-operator-history
- **controller_controls_operator:** Blankenship Walter L → Triple B Coal Inc; 1975-03-01 to 1977-06-20; source msha-controller-operator-history
- **operator_operates_mine:** Solid Energy Inc → Mine #1; 1977-06-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Stacey Roger L → Mine #1; 1977-06-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stacey Roger L → Solid Energy Inc; 1977-06-21 to current/open; source msha-controller-operator-history