# Relationship history for MSHA mine 1510712

Current hierarchy: **Cornett Leewood → Fogertown Coal → No1**

- 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:** Cornett Coal Company → No1; 1977-08-01 to 1986-04-02; source msha-controller-operator-history
- **controller_controls_mine:** Cornett Joe → No1; 1977-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cornett Joe → Cornett Coal Company; 1977-08-01 to 1986-04-02; source msha-controller-operator-history
- **operator_operates_mine:** Fogertown Coal → No1; 1986-04-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cornett Leewood Et Al → No1; 1986-04-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cornett Leewood Et Al → Fogertown Coal; 1986-04-03 to current/open; source msha-controller-operator-history