# Relationship history for MSHA mine 1508610

Current hierarchy: **Gorman L D → Vegas Coals Inc → #1 Surface**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Kem Coal & Vegas Coal Company Inc → #1 Surface; 1975-08-28 to 1977-10-11; source msha-controller-operator-history
- **controller_controls_mine:** Kem Coal & Vegas Coal Company Inc → #1 Surface; 1975-08-28 to 1977-10-11; source msha-controller-operator-history
- **controller_controls_operator:** Kem Coal & Vegas Coal Company Inc → Kem Coal & Vegas Coal Company Inc; 1975-08-28 to 1977-10-11; source msha-controller-operator-history
- **operator_operates_mine:** Vegas Coals Inc → #1 Surface; 1977-10-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gorman L D → #1 Surface; 1977-10-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gorman L D → Vegas Coals Inc; 1977-10-12 to current/open; source msha-controller-operator-history