# Relationship history for MSHA mine 4606581

Current hierarchy: **Swartz James C Jr → D & A Resources Inc → Mine No 1**

- 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:** Smith Leonard O → Mine No 1; 1981-06-16 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Jls Coal Corp → Mine No 1; 1982-09-01 to 1984-11-13; source msha-controller-operator-history
- **controller_controls_operator:** Smith Leonard O → Jls Coal Corp; 1982-09-01 to 1984-11-13; source msha-controller-operator-history
- **operator_operates_mine:** Robell Mining Inc → Mine No 1; 1984-11-14 to 1985-07-29; source msha-controller-operator-history
- **controller_controls_mine:** Falk John → Mine No 1; 1984-11-14 to 1985-07-29; source msha-controller-operator-history
- **controller_controls_operator:** Falk John → Robell Mining Inc; 1984-11-14 to 1985-07-29; source msha-controller-operator-history
- **operator_operates_mine:** L & E Inc → Mine No 1; 1985-07-30 to 1987-01-18; source msha-controller-operator-history
- **controller_controls_mine:** Carter Leon H → Mine No 1; 1985-07-30 to 1987-01-18; source msha-controller-operator-history
- **controller_controls_operator:** Carter Leon H → L & E Inc; 1985-07-30 to 1987-01-18; source msha-controller-operator-history
- **operator_operates_mine:** Ackley-Houston Corp → Mine No 1; 1987-01-19 to 1987-02-11; source msha-controller-operator-history
- **controller_controls_mine:** Swartz James C Jr → Mine No 1; 1987-01-19 to 1987-02-11; source msha-controller-operator-history
- **controller_controls_operator:** Swartz James C Jr → Ackley-Houston Corp; 1987-01-19 to 1987-02-11; source msha-controller-operator-history
- **operator_operates_mine:** Inco Coal Corp → Mine No 1; 1987-02-12 to 1987-10-18; source msha-controller-operator-history
- **controller_controls_mine:** Ingram Robert R → Mine No 1; 1987-02-12 to 1987-10-18; source msha-controller-operator-history
- **controller_controls_operator:** Ingram Robert R → Inco Coal Corp; 1987-02-12 to 1987-10-18; source msha-controller-operator-history
- **operator_operates_mine:** D & A Resources Inc → Mine No 1; 1987-10-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Swartz James C Jr → Mine No 1; 1987-10-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Swartz James C Jr → D & A Resources Inc; 1987-10-19 to current/open; source msha-controller-operator-history