# Relationship history for MSHA mine 4001776

Current hierarchy: **Roger E  West → Srs Coal Inc → #1 Mine Strip**

- 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:** S R S Coal Inc → #1 Mine Strip; 1975-04-01 to 1980-11-05; source msha-controller-operator-history
- **controller_controls_mine:** Sexton Leroy → #1 Mine Strip; 1975-04-01 to 1980-11-05; source msha-controller-operator-history
- **controller_controls_operator:** Sexton Leroy → S R S Coal Inc; 1975-04-01 to 1980-11-05; source msha-controller-operator-history
- **operator_operates_mine:** Srs Coal Inc → #1 Mine Strip; 1980-11-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Roger E  West → #1 Mine Strip; 1980-11-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roger E  West → Srs Coal Inc; 1980-11-06 to current/open; source msha-controller-operator-history