# Relationship history for MSHA mine 0503932

Current hierarchy: **Savage Companies → Savage Coal Service Corp → Tipple #3 (Twenty Mile Coal Co)**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Savage Coal Service Corp → Tipple #3 (Twenty Mile Coal Co); 1984-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Savage Companies → Tipple #3 (Twenty Mile Coal Co); 1984-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Savage Companies → Savage Coal Service Corp; 1984-03-01 to current/open; source msha-controller-operator-history