# Relationship history for MSHA mine 4102883

Current hierarchy: **Logan R C → Logan Materials → Woodruff 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

- **operator_operates_mine:** H C W Construction Company Inc → Woodruff Quarry; 1979-01-01 to 1981-12-01; source msha-controller-operator-history
- **controller_controls_mine:** Hall Q L → Woodruff Quarry; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hall Q L → H C W Construction Company Inc; 1979-01-01 to 1981-12-01; source msha-controller-operator-history
- **operator_operates_mine:** Logan Materials → Woodruff Quarry; 1981-12-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Logan R C → Woodruff Quarry; 1981-12-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Logan R C → Logan Materials; 1981-12-02 to current/open; source msha-controller-operator-history