# Relationship history for MSHA mine 1504323

Current hierarchy: **Cyprus Amax Minerals Company → Savoy Coals Inc → Faber Tipple**

- 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:** Rapoca Resources → Faber Tipple; 1950-01-01 to 1972-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Fields Resources Inc → Faber Tipple; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fields Resources Inc → Rapoca Resources; 1950-01-01 to 1972-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Mountain Coals Inc → Faber Tipple; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Savoy Coals Inc → Faber Tipple; 1973-01-01 to 1981-09-14; source msha-controller-operator-history
- **controller_controls_operator:** Mountain Coals Inc → Savoy Coals Inc; 1973-01-01 to 1981-09-14; source msha-controller-operator-history
- **operator_operates_mine:** Savoy Coals Inc → Faber Tipple; 1981-09-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cyprus Amax Minerals Company → Faber Tipple; 1981-09-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cyprus Amax Minerals Company → Savoy Coals Inc; 1981-09-15 to current/open; source msha-controller-operator-history