# Relationship history for MSHA mine 3400059

Current hierarchy: **Ellen  Willis → Oklahoma Red Granite → Willis 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** J R Willis Granite Company → Willis Quarry; 1950-01-01 to 1989-02-28; source msha-controller-operator-history
- **controller_controls_mine:** J R  Willis → Willis Quarry; 1950-01-01 to 1989-02-28; source msha-controller-operator-history
- **controller_controls_operator:** J R  Willis → J R Willis Granite Company; 1950-01-01 to 1989-02-28; source msha-controller-operator-history
- **operator_operates_mine:** Oklahoma Red Granite Inc → Willis Quarry; 1989-03-01 to 1998-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Ellen  Willis → Willis Quarry; 1989-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ellen  Willis → Oklahoma Red Granite Inc; 1989-03-01 to 1998-08-31; source msha-controller-operator-history
- **operator_operates_mine:** Polycor U S → Willis Quarry; 1998-09-01 to 2006-05-01; source msha-controller-operator-history
- **controller_controls_mine:** Polycor Inc → Willis Quarry; 1998-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Polycor Inc → Polycor U S; 1998-09-01 to 2006-05-01; source msha-controller-operator-history
- **operator_operates_mine:** Oklahoma Red Granite → Willis Quarry; 2006-05-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ellen  Willis → Oklahoma Red Granite; 2006-05-02 to current/open; source msha-controller-operator-history