# Relationship history for MSHA mine 0100841

Current hierarchy: **Jenkins Brick Company → Jenkins Brick Company → Maddox 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

- **controller_controls_mine:** Dravo Corp → Maddox Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** R & S Materials Inc → Maddox Pit; 1950-01-01 to 1985-02-05; source msha-controller-operator-history
- **controller_controls_mine:** Maddox Ken R → Maddox Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Maddox Ken R → R & S Materials Inc; 1950-01-01 to 1985-02-05; source msha-controller-operator-history
- **controller_controls_mine:** Jenkins Brick Company → Maddox Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** R & S Materials Inc → Maddox Pit; 1985-02-06 to 1990-01-14; source msha-controller-operator-history
- **controller_controls_mine:** Alfred Mc Alpine Inc → Maddox Pit; 1985-02-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alfred Mc Alpine Inc → R & S Materials Inc; 1985-02-06 to 1990-01-14; source msha-controller-operator-history
- **operator_operates_mine:** Dravo Basic Materials Company Inc → Maddox Pit; 1990-01-15 to 1994-07-12; source msha-controller-operator-history
- **controller_controls_operator:** Dravo Corp → Dravo Basic Materials Company Inc; 1990-01-15 to 1994-07-12; source msha-controller-operator-history
- **operator_operates_mine:** Jenkins Brick Company → Maddox Pit; 1994-07-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jenkins Brick Company → Jenkins Brick Company; 1994-07-13 to current/open; source msha-controller-operator-history