# Relationship history for MSHA mine 4502357

Current hierarchy: **L G  Cunningham → L G Cunningham → Oak Harbor 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:** Lakeside Industries → Oak Harbor Pit; 1950-01-01 to 1979-05-21; source msha-controller-operator-history
- **controller_controls_mine:** Lakeside Industries Inc. et al → Oak Harbor Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lakeside Industries Inc. et al → Lakeside Industries; 1950-01-01 to 1979-05-21; source msha-controller-operator-history
- **operator_operates_mine:** L G Cunningham → Oak Harbor Pit; 1979-05-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** L G  Cunningham → Oak Harbor Pit; 1979-05-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** L G  Cunningham → L G Cunningham; 1979-05-22 to current/open; source msha-controller-operator-history