# Relationship history for MSHA mine 5001674

Current hierarchy: **Tom  Coursen → Tomco Industries → Arm Pit**

- 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:** Tomco Industries → Arm Pit; 2000-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tom  Coursen → Arm Pit; 2000-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tom  Coursen → Tomco Industries; 2000-11-01 to current/open; source msha-controller-operator-history