# Relationship history for MSHA mine 3503041

Current hierarchy: **Hatch Robert → Empco → Lakewood 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:** Col-Agg → Lakewood Pit; 1980-10-01 to 1984-06-06; source msha-controller-operator-history
- **controller_controls_mine:** Jochim Eric M → Lakewood Pit; 1980-10-01 to 1984-06-06; source msha-controller-operator-history
- **controller_controls_operator:** Jochim Eric M → Col-Agg; 1980-10-01 to 1984-06-06; source msha-controller-operator-history
- **operator_operates_mine:** Empco → Lakewood Pit; 1984-06-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hatch Robert → Lakewood Pit; 1984-06-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hatch Robert → Empco; 1984-06-07 to current/open; source msha-controller-operator-history