# Relationship history for MSHA mine 1508310

Current hierarchy: **Sexton Gomer → T H C Mining Company → No 7 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:** T H C Mining Company → No 7 Mine; 1975-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Sexton Gomer Et Al → No 7 Mine; 1975-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sexton Gomer Et Al → T H C Mining Company; 1975-05-01 to current/open; source msha-controller-operator-history