# Relationship history for MSHA mine 4401225

Current hierarchy: **Cyprus Amax Minerals Company → Knox Creek Coal Corp → Swords Creek Prep Plant**

- 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:** Phillipi Richard E → Swords Creek Prep Plant; 1974-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Holston Corp → Swords Creek Prep Plant; 1976-06-01 to 1980-01-03; source msha-controller-operator-history
- **controller_controls_mine:** Van Dyke Claude H → Swords Creek Prep Plant; 1976-06-01 to 1980-01-03; source msha-controller-operator-history
- **controller_controls_operator:** Van Dyke Claude H → Holston Corp; 1976-06-01 to 1980-01-03; source msha-controller-operator-history
- **operator_operates_mine:** W P Corp → Swords Creek Prep Plant; 1980-01-04 to 1984-12-19; source msha-controller-operator-history
- **controller_controls_operator:** Phillipi Richard E → W P Corp; 1980-01-04 to 1984-12-19; source msha-controller-operator-history
- **operator_operates_mine:** Bamco Coal Corp → Swords Creek Prep Plant; 1984-12-20 to 1985-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Mc Glothlin James T → Swords Creek Prep Plant; 1984-12-20 to 1985-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Mc Glothlin James T → Bamco Coal Corp; 1984-12-20 to 1985-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Knox Creek Coal Corp → Swords Creek Prep Plant; 1985-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cyprus Amax Minerals Company → Swords Creek Prep Plant; 1985-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cyprus Amax Minerals Company → Knox Creek Coal Corp; 1985-10-01 to current/open; source msha-controller-operator-history