# Relationship history for MSHA mine 4404607

Current hierarchy: **Collins Franklin T → Magnum Contractors → No 1 Strip**

- 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:** Titan Coal Corp → No 1 Strip; 1977-01-01 to 1977-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Pilkenton Earl → No 1 Strip; 1977-01-01 to 1977-08-31; source msha-controller-operator-history
- **controller_controls_operator:** Pilkenton Earl → Titan Coal Corp; 1977-01-01 to 1977-08-31; source msha-controller-operator-history
- **operator_operates_mine:** Magnum Contractors → No 1 Strip; 1977-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Collins Franklin T → No 1 Strip; 1977-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Collins Franklin T → Magnum Contractors; 1977-09-01 to current/open; source msha-controller-operator-history