# Relationship history for MSHA mine 4502945

Current hierarchy: **Lakeside Industries Inc. → Lakeside Industries → Ames Quarry**

- 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 → Ames Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** R C Harding Construction Company → Ames Quarry; 1981-10-01 to 1981-11-30; source msha-controller-operator-history
- **controller_controls_mine:** Harding R C Construction Company → Ames Quarry; 1981-10-01 to 1981-11-30; source msha-controller-operator-history
- **controller_controls_operator:** Harding R C Construction Company → R C Harding Construction Company; 1981-10-01 to 1981-11-30; source msha-controller-operator-history
- **operator_operates_mine:** Lakeside Industries → Ames Quarry; 1981-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lakeside Industries Inc. et al → Lakeside Industries; 1981-12-01 to current/open; source msha-controller-operator-history