# Relationship history for MSHA mine 4500972

Current hierarchy: **Lakeside Industries Inc. → Lakeside Industries → Mt Pleasant 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

- **controller_controls_mine:** Lakeside Industries Inc. et al → Mt Pleasant Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** J D Shotwell Company → Mt Pleasant Pit; 1950-01-01 to 1982-11-11; source msha-controller-operator-history
- **controller_controls_mine:** Lillian M  Shotwell → Mt Pleasant Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lillian M  Shotwell → J D Shotwell Company; 1950-01-01 to 1982-11-11; source msha-controller-operator-history
- **operator_operates_mine:** Lakeside Industries → Mt Pleasant Pit; 1982-11-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lakeside Industries Inc. et al → Lakeside Industries; 1982-11-12 to current/open; source msha-controller-operator-history