# Relationship history for MSHA mine 3502912

Current hierarchy: **Owen Fred Jr → Medford Ready Mix Concrete Inc → Modoc 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Modoc Rock → Modoc Pit; 1979-01-01 to 1980-01-16; source msha-controller-operator-history
- **controller_controls_mine:** Brooks Charles W & Carl Bismark → Modoc Pit; 1979-01-01 to 1980-01-16; source msha-controller-operator-history
- **controller_controls_operator:** Brooks Charles W & Carl Bismark → Modoc Rock; 1979-01-01 to 1980-01-16; source msha-controller-operator-history
- **operator_operates_mine:** Modoc Rock → Modoc Pit; 1980-01-17 to 1981-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Hunter Crock J & Jerry German → Modoc Pit; 1980-01-17 to 1981-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Hunter Crock J & Jerry German → Modoc Rock; 1980-01-17 to 1981-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Modoc Rock → Modoc Pit; 1982-01-01 to 1984-02-15; source msha-controller-operator-history
- **controller_controls_mine:** Gurley Phillip S → Modoc Pit; 1982-01-01 to 1984-02-15; source msha-controller-operator-history
- **controller_controls_operator:** Gurley Phillip S → Modoc Rock; 1982-01-01 to 1984-02-15; source msha-controller-operator-history
- **operator_operates_mine:** Incline Crushing Inc → Modoc Pit; 1984-02-16 to 1986-04-14; source msha-controller-operator-history
- **controller_controls_mine:** Williams Lee D → Modoc Pit; 1984-02-16 to 1986-04-14; source msha-controller-operator-history
- **controller_controls_operator:** Williams Lee D → Incline Crushing Inc; 1984-02-16 to 1986-04-14; source msha-controller-operator-history
- **operator_operates_mine:** Oregon Gravel & Asphalt → Modoc Pit; 1986-04-15 to 1987-11-14; source msha-controller-operator-history
- **controller_controls_mine:** Bellamy C Robert → Modoc Pit; 1986-04-15 to 1987-11-14; source msha-controller-operator-history
- **controller_controls_operator:** Bellamy C Robert → Oregon Gravel & Asphalt; 1986-04-15 to 1987-11-14; source msha-controller-operator-history
- **operator_operates_mine:** Brabco Rock & Asphalt → Modoc Pit; 1987-11-15 to 1988-02-22; source msha-controller-operator-history
- **controller_controls_mine:** Brabbin Michael A & Hugh W Houck → Modoc Pit; 1987-11-15 to 1988-02-22; source msha-controller-operator-history
- **controller_controls_operator:** Brabbin Michael A & Hugh W Houck → Brabco Rock & Asphalt; 1987-11-15 to 1988-02-22; source msha-controller-operator-history
- **operator_operates_mine:** Brabco → Modoc Pit; 1988-02-23 to 1991-11-18; source msha-controller-operator-history
- **controller_controls_mine:** Brabbin Michael → Modoc Pit; 1988-02-23 to 1991-11-18; source msha-controller-operator-history
- **controller_controls_operator:** Brabbin Michael → Brabco; 1988-02-23 to 1991-11-18; source msha-controller-operator-history
- **operator_operates_mine:** Medford Ready Mix Concrete Inc → Modoc Pit; 1991-11-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Owen Fred Jr → Modoc Pit; 1991-11-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Owen Fred Jr → Medford Ready Mix Concrete Inc; 1991-11-19 to current/open; source msha-controller-operator-history