# Relationship history for MSHA mine 3303918

Current hierarchy: **Holmes Limestone Company → Horizon Coal Corp → Horizon Strip - Canton**

- 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:** Compass International Corp → Horizon Strip - Canton; 1982-11-22 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Horizon Coal Corp → Horizon Strip - Canton; 1982-12-01 to 1985-11-18; source msha-controller-operator-history
- **controller_controls_operator:** Compass International Corp → Horizon Coal Corp; 1982-12-01 to 1985-11-18; source msha-controller-operator-history
- **operator_operates_mine:** Horizon Coal Corp → Horizon Strip - Canton; 1985-11-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Holmes Limestone Company → Horizon Strip - Canton; 1985-11-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Holmes Limestone Company → Horizon Coal Corp; 1985-11-19 to current/open; source msha-controller-operator-history