# Relationship history for MSHA mine 0100756

Current hierarchy: **Thornton Irma Jean → Lost Creek Coal Mining Corp → Hilliard No 3**

- 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

- **controller_controls_mine:** West Ed → Hilliard No 3; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** West Coal Company Inc → Hilliard No 3; 1972-02-01 to 1973-04-01; source msha-controller-operator-history
- **controller_controls_operator:** West Ed → West Coal Company Inc; 1972-02-01 to 1973-04-01; source msha-controller-operator-history
- **operator_operates_mine:** W T W Coal Company → Hilliard No 3; 1973-04-02 to 1973-08-14; source msha-controller-operator-history
- **controller_controls_mine:** W T W Coal Company → Hilliard No 3; 1973-04-02 to 1973-08-14; source msha-controller-operator-history
- **controller_controls_operator:** W T W Coal Company → W T W Coal Company; 1973-04-02 to 1973-08-14; source msha-controller-operator-history
- **operator_operates_mine:** Lost Creek Coal Mining Corp → Hilliard No 3; 1973-08-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Thornton Irma Jean → Hilliard No 3; 1973-08-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thornton Irma Jean → Lost Creek Coal Mining Corp; 1973-08-15 to current/open; source msha-controller-operator-history