# Relationship history for MSHA mine 2101483

Current hierarchy: **Hindermann Mark J & William A Fitzgerald → North Star Asphalt Company → Fields 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

- **controller_controls_mine:** Knapp Howard L → Fields Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Charlson Excavating Inc → Fields Pit; 1950-01-01 to 1981-06-16; source msha-controller-operator-history
- **controller_controls_mine:** Charlson Arnold → Fields Pit; 1950-01-01 to 1987-07-05; source msha-controller-operator-history
- **controller_controls_operator:** Charlson Arnold → Charlson Excavating Inc; 1950-01-01 to 1981-06-16; source msha-controller-operator-history
- **operator_operates_mine:** Knapp Excavating → Fields Pit; 1981-06-17 to 1983-06-28; source msha-controller-operator-history
- **controller_controls_operator:** Knapp Howard L → Knapp Excavating; 1981-06-17 to 1983-06-28; source msha-controller-operator-history
- **operator_operates_mine:** North Star Asphalt Company → Fields Pit; 1983-06-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hindermann Mark J & William A Fitzgerald → Fields Pit; 1983-06-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hindermann Mark J & William A Fitzgerald → North Star Asphalt Company; 1983-06-29 to current/open; source msha-controller-operator-history